Prefect Server UI is Blank on latest master

[peterroelants]

Description

The Prefect UI stays Blank when starting prefect server on latest master (db0f6521f9fad3891b885aaa961c0462d61f2692). There is a AuthSdkError message in the JS console. See screenshot:

Full JS Console Error:

okta-auth-js.umd.js:361 Uncaught AuthSdkError: No issuer passed to constructor. Required usage: new OktaAuth({issuer: "https://{yourOktaDomain}.com/oauth2/{authServerId}"})
    at http://localhost:8080/js/defaultVendors~app~253ae210.2d09f131.js:287:48
    at new e (http://localhost:8080/js/defaultVendors~app~253ae210.2d09f131.js:287:780)
    at r.<anonymous> (http://localhost:8080/js/defaultVendors~app~253ae210.2d09f131.js:356:84)
    at new r (http://localhost:8080/js/defaultVendors~app~253ae210.2d09f131.js:356:201)
    at Object.4360 (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:52687)
    at s (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:595)
    at Object.ca94 (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:236587)
    at s (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:595)
    at Module.56d7 (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:110723)
    at s (http://localhost:8080/js/app~d0ae3f07.c02a2b6e.js:1:595)
i @ okta-auth-js.umd.js:361
t @ okta-auth-js.umd.js:190
(anonymous) @ okta-auth-js.umd.js:157
r @ okta-auth-js.umd.js:157
(anonymous) @ okta-auth-js.umd.js:36
r @ okta-auth-js.umd.js:36
(anonymous) @ okta-auth-js.umd.js:291
e @ okta-auth-js.umd.js:291
(anonymous) @ okta-auth-js.umd.js:361
r @ okta-auth-js.umd.js:361
4360 @ index.js:13
s @ bootstrap:89
ca94 @ app~d0ae3f07.c02a2b6e.js:1
s @ bootstrap:89
56d7 @ app~d0ae3f07.c02a2b6e.js:1
s @ bootstrap:89
0 @ app~d0ae3f07.c02a2b6e.js:1
s @ bootstrap:89
n @ bootstrap:45
(anonymous) @ bootstrap:267
(anonymous) @ app~d0ae3f07.c02a2b6e.js:1

Expected Behavior

Prefect UI to work as before.

Reproduction

• Pull latest master
• Install dev pip install -e ".[dev]"
• Set backend to server: prefect backend server
• Start server: prefect server start
• Go to http://localhost:8080/ in chrome

Environment

Pip installed prefect in clean conda environment conda version = 4.9.2.

Prefect diagnostics:

{
  "config_overrides": {},
  "env_vars": [],
  "system_information": {
    "platform": "Linux-5.8.0-41-generic-x86_64-with-glibc2.10",
    "prefect_backend": "server",
    "prefect_version": "0.14.5+17.gdb0f6521f",
    "python_version": "3.8.5"
  }
}

Tested on Chrome Version 88.0.4324.96 (Official Build) (64-bit) (Same issue both normal and incognito mode), similar behaviour in Firefox.

[peterroelants]

@znicholasbrown The issue seems to be back on the new prefecthq/ui:core-0.14.6 image. I don't have this issue on core-0.14.5.

[Samreay]

+1 from me on this too, and can also confirm that rolling back to 0.14.5 got the UI generating for me as well.