Error: Cannot parse given Error object

[nbarrett]

Hey @jan-molak! Having some good success migrating my 1.x project with the assistance of the excellent new handbook: Upgrading to Serenity/JS 2.0 😄

One thing that's cropped up that I think might be a bug is an exception that's thrown Error: Cannot parse given Error object at .Object.ErrorStackParser$$parse [as parse]()(node_modules/error-stack-parser/error-stack-parser.js:35) .ErrorStackParser.parse()(node_modules/@serenity-js/core/src/io/ErrorStackParser.ts:13) .ErrorRenderer.renderError()(node_modules/@serenity-js/serenity-bdd/src/stage/crew/serenity-bdd-reporter/reports/ErrorRenderer.ts:21). I've googled this and have found mention of this error in this comment but I'm not invoking new Error() anywhere in my code. One interesting thing is that the page does contain some text with "Error: " in it, but I wouldn't have expected that to trip anything up. For completeness I've enclosed the json file that got produced in that test run here (sorry if it's a bit on the long side!):

{
  "name": "process command parameters",
  "title": "process command parameters",
  "id": "walks-and-events-manager;process-command-parameters;chrome-81-0-4044-122;mac-os-x",
  "manual": false,
  "testSteps": [
    {
      "number": 1,
      "description": "nick performs ExtractTask",
      "startTime": 1588035256758,
      "children": [
        {
          "number": 2,
          "description": "nick performs Log",
          "startTime": 1588035256759,
          "children": [],
          "reportData": [],
          "screenshots": [],
          "result": "SUCCESS",
          "duration": 1
        }
      ],
      "reportData": [],
      "screenshots": [],
      "result": "SUCCESS",
      "duration": 3
    },
    {
      "number": 3,
      "description": "nick disables synchronisation with Angular",
      "startTime": 1588035256761,
      "children": [],
      "reportData": [],
      "screenshots": [
        {
          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-disables-synchronisation-with-angular-e48e83d1a6.png"
        }
      ],
      "result": "SUCCESS",
      "duration": 1
    },
    {
      "number": 4,
      "description": "nick starts on the walks and events manager\"",
      "startTime": 1588035256763,
      "children": [
        {
          "number": 5,
          "description": "nick starts with navigation to http://www.ramblers.org.uk/group-walks-and-events-manager.aspx",
          "startTime": 1588035256764,
          "children": [
            {
              "number": 6,
              "description": "nick disables synchronisation with Angular",
              "startTime": 1588035256764,
              "children": [],
              "reportData": [],
              "screenshots": [
                {
                  "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-disables-synchronisation-with-angular-e48e83d1a6.png"
                }
              ],
              "result": "SUCCESS",
              "duration": 0
            },
            {
              "number": 7,
              "description": "nick navigates to 'http://www.ramblers.org.uk/group-walks-and-events-manager.aspx'",
              "startTime": 1588035256765,
              "children": [],
              "reportData": [],
              "screenshots": [
                {
                  "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-navigates-to-httpwww.ramblers.org.ukgroup-walks-and-events-manager.aspx-28d05fc5d9.png"
                }
              ],
              "result": "SUCCESS",
              "duration": 2684
            }
          ],
          "reportData": [],
          "screenshots": [],
          "result": "SUCCESS",
          "duration": 2686
        }
      ],
      "reportData": [],
      "screenshots": [],
      "result": "SUCCESS",
      "duration": 2688
    },
    {
      "number": 8,
      "description": "nick logs into Ramblers",
      "startTime": 1588035259451,
      "children": [
        {
          "number": 9,
          "description": "nick ensures that the text of the login status does equal 'Login'",
          "startTime": 1588035259453,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-ensures-that-the-text-of-the-login-status-does-equal-login-28d05fc5d9.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 350
        },
        {
          "number": 10,
          "description": "nick performs Hide",
          "startTime": 1588035259803,
          "children": [],
          "reportData": [],
          "screenshots": [],
          "result": "SUCCESS",
          "duration": 468
        },
        {
          "number": 11,
          "description": "nick waits up to 10s until the chat window does not become visible",
          "startTime": 1588035260272,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-10s-until-the-chat-window-does-not-become-visible-a33a583738.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 6
        },
        {
          "number": 12,
          "description": "nick enters 'blah.blah@example.com' into the user name",
          "startTime": 1588035260279,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-enters-blah.blah@example.com-into-the-user-name-ba6c0b1c12.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 528
        },
        {
          "number": 13,
          "description": "nick enters 'xxxxxxxxxx' into the password",
          "startTime": 1588035260808,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-enters-xxxxxxxxxx-into-the-password-5dec8f9084.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 358
        },
        {
          "number": 14,
          "description": "nick clicks on the login button",
          "startTime": 1588035261167,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-clicks-on-the-login-button-255616328c.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 5607
        },
        {
          "number": 15,
          "description": "nick ensures that the text of the login status does equal 'Logout'",
          "startTime": 1588035266775,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-ensures-that-the-text-of-the-login-status-does-equal-logout-255616328c.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 325
        }
      ],
      "reportData": [],
      "screenshots": [],
      "result": "SUCCESS",
      "duration": 7650
    },
    {
      "number": 16,
      "description": "nick filters walks to show all",
      "startTime": 1588035267101,
      "children": [
        {
          "number": 17,
          "description": "nick ensures that the select all walks button does become present",
          "startTime": 1588035267102,
          "children": [
            {
              "number": 18,
              "description": "nick performs Hide",
              "startTime": 1588035267410,
              "children": [
                {
                  "number": 19,
                  "description": "nick executes a synchronous script with arguments: [ the chat window ]",
                  "startTime": 1588035267423,
                  "children": [],
                  "reportData": [
                    {
                      "id": "report-data-ck9j772i10012j7dyfvkyf92z",
                      "isEvidence": false,
                      "path": "",
                      "title": "Script source",
                      "contents": "arguments[0].style.visibility='hidden'"
                    }
                  ],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-executes-a-synchronous-script-with-arguments-[-the-chat-window-]-616db78da1.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 10
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 24
            },
            {
              "number": 20,
              "description": "nick clicks on the items per page popup when ready",
              "startTime": 1588035267434,
              "children": [
                {
                  "number": 21,
                  "description": "nick waits for processing to complete",
                  "startTime": 1588035267434,
                  "children": [
                    {
                      "number": 22,
                      "description": "nick waits up to 1m until the progress indicator does not become visible",
                      "startTime": 1588035267435,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-progress-indicator-does-not-become-visible-616db78da1.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 307
                    },
                    {
                      "number": 23,
                      "description": "nick waits up to 1m until the loader indicator does not become visible",
                      "startTime": 1588035267743,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-loader-indicator-does-not-become-visible-616db78da1.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 300
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 609
                },
                {
                  "number": 24,
                  "description": "nick performs Hide",
                  "startTime": 1588035268044,
                  "children": [
                    {
                      "number": 25,
                      "description": "nick executes a synchronous script with arguments: [ the chat window ]",
                      "startTime": 1588035268335,
                      "children": [],
                      "reportData": [
                        {
                          "id": "report-data-ck9j77379001fj7dy8q2d5p74",
                          "isEvidence": false,
                          "path": "",
                          "title": "Script source",
                          "contents": "arguments[0].style.visibility='hidden'"
                        }
                      ],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-executes-a-synchronous-script-with-arguments-[-the-chat-window-]-616db78da1.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 6
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 298
                },
                {
                  "number": 26,
                  "description": "nick waits up to 10s until the items per page popup does become visible",
                  "startTime": 1588035268342,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-10s-until-the-items-per-page-popup-does-become-visible-616db78da1.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 303
                },
                {
                  "number": 27,
                  "description": "nick clicks on the items per page popup",
                  "startTime": 1588035268646,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-clicks-on-the-items-per-page-popup-c5375ec109.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 320
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 1532
            },
            {
              "number": 28,
              "description": "nick clicks on the show all walks when ready",
              "startTime": 1588035268967,
              "children": [
                {
                  "number": 29,
                  "description": "nick waits for processing to complete",
                  "startTime": 1588035268967,
                  "children": [
                    {
                      "number": 30,
                      "description": "nick waits up to 1m until the progress indicator does not become visible",
                      "startTime": 1588035268967,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-progress-indicator-does-not-become-visible-c5375ec109.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 308
                    },
                    {
                      "number": 31,
                      "description": "nick waits up to 1m until the loader indicator does not become visible",
                      "startTime": 1588035269275,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-loader-indicator-does-not-become-visible-c5375ec109.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 302
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 611
                },
                {
                  "number": 32,
                  "description": "nick performs Hide",
                  "startTime": 1588035269578,
                  "children": [
                    {
                      "number": 33,
                      "description": "nick executes a synchronous script with arguments: [ the chat window ]",
                      "startTime": 1588035269867,
                      "children": [],
                      "reportData": [
                        {
                          "id": "report-data-ck9j774dt001yj7dy8nus34o6",
                          "isEvidence": false,
                          "path": "",
                          "title": "Script source",
                          "contents": "arguments[0].style.visibility='hidden'"
                        }
                      ],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-executes-a-synchronous-script-with-arguments-[-the-chat-window-]-c5375ec109.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 6
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 296
                },
                {
                  "number": 34,
                  "description": "nick waits up to 10s until the show all walks does become visible",
                  "startTime": 1588035269875,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-10s-until-the-show-all-walks-does-become-visible-c5375ec109.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 307
                },
                {
                  "number": 35,
                  "description": "nick clicks on the show all walks",
                  "startTime": 1588035270182,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-clicks-on-the-show-all-walks-6bfcd299ce.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 319
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 1534
            },
            {
              "number": 36,
              "description": "nick waits for processing to complete",
              "startTime": 1588035270502,
              "children": [
                {
                  "number": 37,
                  "description": "nick waits up to 1m until the progress indicator does not become visible",
                  "startTime": 1588035270502,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-progress-indicator-does-not-become-visible-c98da0048d.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 2296
                },
                {
                  "number": 38,
                  "description": "nick waits up to 1m until the loader indicator does not become visible",
                  "startTime": 1588035272799,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-loader-indicator-does-not-become-visible-c98da0048d.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 316
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 2615
            }
          ],
          "reportData": [],
          "screenshots": [],
          "result": "SUCCESS",
          "duration": 6015
        }
      ],
      "reportData": [],
      "screenshots": [],
      "result": "SUCCESS",
      "duration": 6016
    },
    {
      "number": 39,
      "description": "nick deletes unpublished walks ",
      "startTime": 1588035273117,
      "children": [
        {
          "number": 40,
          "description": "nick ensures that the select all walks button does become visible",
          "startTime": 1588035273118,
          "children": [
            {
              "number": 41,
              "description": "nick selects walks not published or with ids: ",
              "startTime": 1588035273413,
              "children": [
                {
                  "number": 42,
                  "description": "nick deselects all walks",
                  "startTime": 1588035273524,
                  "children": [
                    {
                      "number": 43,
                      "description": "nick clicks on the clear all walks button",
                      "startTime": 1588035273524,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-clicks-on-the-clear-all-walks-button-fea3cbcc67.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 47
                    },
                    {
                      "number": 44,
                      "description": "nick waits up to 1m until selected walk count to be 0 does equal true",
                      "startTime": 1588035273571,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-selected-walk-count-to-be-0-does-equal-true-d8d3cfde91.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 373
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 421
                },
                {
                  "number": 45,
                  "description": "nick waits for processing to complete",
                  "startTime": 1588035273945,
                  "children": [
                    {
                      "number": 46,
                      "description": "nick waits up to 1m until the progress indicator does not become visible",
                      "startTime": 1588035273945,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-progress-indicator-does-not-become-visible-6cfdbd9410.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 2020
                    },
                    {
                      "number": 47,
                      "description": "nick waits up to 1m until the loader indicator does not become visible",
                      "startTime": 1588035275967,
                      "children": [],
                      "reportData": [],
                      "screenshots": [
                        {
                          "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-the-loader-indicator-does-not-become-visible-6cfdbd9410.png"
                        }
                      ],
                      "result": "SUCCESS",
                      "duration": 316
                    }
                  ],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 2339
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 2872
            },
            {
              "number": 48,
              "description": "nick performs Unpublish",
              "startTime": 1588035276285,
              "children": [
                {
                  "number": 49,
                  "description": "nick performs SaveBrowserSource",
                  "startTime": 1588035276285,
                  "children": [],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 300
                },
                {
                  "number": 50,
                  "description": "nick clicks on the unpublish selected walks button",
                  "startTime": 1588035276585,
                  "children": [],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 46
                },
                {
                  "number": 51,
                  "description": "nick accepts the alert popup",
                  "startTime": 1588035276633,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-accepts-the-alert-popup-89a4a879eb.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 3
                },
                {
                  "number": 52,
                  "description": "nick waits up to 1m until no selected walks to have status of \"Published\" does equal true",
                  "startTime": 1588035276638,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-no-selected-walks-to-have-status-of-published-does-equal-true-234821b3e0.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 420
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 774
            },
            {
              "number": 53,
              "description": "nick performs Delete",
              "startTime": 1588035277060,
              "children": [
                {
                  "number": 54,
                  "description": "nick clicks on the delete selected walks button",
                  "startTime": 1588035277414,
                  "children": [],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 39
                },
                {
                  "number": 55,
                  "description": "nick waits up to 5s until the visibility of an alert does equal a Promise",
                  "startTime": 1588035277455,
                  "children": [],
                  "reportData": [],
                  "screenshots": [],
                  "result": "SUCCESS",
                  "duration": 2
                },
                {
                  "number": 56,
                  "description": "nick accepts the alert popup",
                  "startTime": 1588035277458,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-accepts-the-alert-popup-ee9603f01e.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 2
                },
                {
                  "number": 57,
                  "description": "nick waits up to 1m until error or walk listing count to be 1 does equal true",
                  "startTime": 1588035277461,
                  "children": [],
                  "reportData": [],
                  "screenshots": [
                    {
                      "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-waits-up-to-1m-until-error-or-walk-listing-count-to-be-1-does-equal-true-ee9603f01e.png"
                    }
                  ],
                  "result": "SUCCESS",
                  "duration": 375
                }
              ],
              "reportData": [],
              "screenshots": [],
              "result": "SUCCESS",
              "duration": 777
            }
          ],
          "reportData": [],
          "screenshots": [],
          "result": "SUCCESS",
          "duration": 4719
        }
      ],
      "reportData": [],
      "screenshots": [],
      "result": "SUCCESS",
      "duration": 4720
    },
    {
      "number": 58,
      "description": "nick prepares to upload file /tmp/ramblers/testfile-1588035251070.csv containing 2 walks",
      "startTime": 1588035277838,
      "children": [
        {
          "number": 59,
          "description": "nick clicks on the CSV file accordion expander",
          "startTime": 1588035277838,
          "children": [],
          "reportData": [],
          "screenshots": [
            {
              "screenshot": "photo-mac-os-x-chrome-81.0.4044.122-nick-clicks-on-the-csv-file-accordion-expander-2908a0cd3f.png"
            }
          ],
          "result": "SUCCESS",
          "duration": 330
        },
        {
          "number": 60,
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[jan-molak]

That's interesting, would you be able to publish a mini-project to Github that demonstrates this issue so I could try to reproduce it? Also, it might be useful to add StreamReporter to your stage crew to see if it tells us more about that error.

It seems to me that something somewhere throws a string (or some other junk), that's not a proper Error object, and when ErrorRenderer tries to parse, the parser it uses, so error-stack-parser blows up.

You could also add a console.dir(error) in ErrorRenderer.js render(error) method to quickly see what it's given.

[nbarrett]

Hi Again @jan-molak - I did manage to diagnose the problem and fix it as it was actually in my own code but I thought I'd give you a reproducible example anyway as I think this might still be a bug. It happens when a rejected Promise is returned by a Task. For instance have a look here.

What that looks like in the report is this:
which is normally (well, in serenity-screenplay-java version anyway), something that happens when exceptions are thrown outside of the serenity framework lifecycle e.g. in a @Before or @After code.

But thanks for your pointers! 👍

[jan-molak]

Ah right, I see, so the issue is when custom code throws stuff that's not an Error. Well, it shouldn't be doing that :-) But yeah, it might be good from dev experience perspective if Serenity/JS caught things like that. Thanks!