2 Errors E020: Could not parse server response. AND Trying to insert an already existing item into OrderTracker

[tchap2]

Describe the bug
A clear and concise description of what the bug is.

When I sync Firefox toolbar with /xyz folder on server, I get error message:

"E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data "

I DELETED account and folder from Nextcloud (to flush ALL changes from server), then added account again but this time as follows:

When I sync Firefox bookmarks (ROOT) with /xyz folder on server, I get error message: Trying to insert an already existing item into OrderTracker: bookmark:1nEHKoutQMqH

To Reproduce
Steps to reproduce the behavior:

1. Go to 'add new account, map local folder "Bookmarks Toolbar" to server folder "/XYZ".'
2. Click on '.SYNC NOW'
3. Scroll down to '....' - NOT APPLICABLE
4. See error
   E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data E020: Could not parse server response. Is the bookmarks app installed on your server? JSON.parse: unexpected character at line 1 column 1 of the JSON data

To Reproduce - ACTION 2
Steps to reproduce the behavior:

1. Go to 'add new account, map local ROOT (!!!) folder "Untitled Folder" to server folder "/XYZ".'
2. Click on '.SYNC NOW'
3. Scroll down to '....' - NOT APPLICABLE
4. See error
   Trying to insert an already existing item into OrderTracker: bookmark:1nEHKoutQMqH

Expected behavior
Completed sync without errors

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: iOS
• Browser - firefox
• Browser Version - 79.0
• Floccus version: 4.2.6
• Floccus sync method: nextcloud folders

Server (please complete the following information):

• OS: ---
• Nextcloud version: 17.0.1
• Bookmarks app version: ---

Note: Please write down the actual version numbers instead of writing 'latest'.

Debug log
It is often useful to provide a debug log file along with the issue. You can obtain a debug log of the most recent sync runs by clicking 'Debug log' in the bottom right corner of the floccus panel in your browser.

Note: As your debug log usually contains large parts of your bookmark data, instead of attaching it publicly to the issue here, I recommend uploading it privately at the following URL https://klehranlage.net/index.php/s/7nn82NSBsfQKdsJ

• Debug log provided

Additional context
Add any other context about the problem here.

[marcelklehr]

I'm not sure what happened on the first try, but the second try is probably an incarnation of #598 which will be fixed with the next release. I'll leave this open till then.

[marcelklehr]

@tchap2 Do you still experience this issue?

[marcelklehr]

(The first error could actually be due to nextcloud brute force protection kicking in)

[CouldBeThis]

I am not sure if this is directly helpful but I am going to post in case it's useful to someone else who is a bit dense like me and searches for it.

Also got e020 on new install. Content of the logs was basically

Starting sync process for account nextcloud@host.com
Using normal strategy
Fetching bookmarks
Syncing failed with E020: Could not parse server response. Is the bookmarks app installed on your server?
JSON.parse: unexpected character at line 1 column 1 of the JSON data

The solution:

In the field labeled nextcloud URL you put the URL of the nextcloud, not the webDAV URL

https://nextcloud.host.com/ not https://nextcloud.host.com/remote.php/dav/files/user/

floccus is clever enough to figure out the rest.

[marcelklehr]

Thanks for all your feedback, folks! I'm currently working on a new iteration of the sync algorithm that should fix this: #651

[marcelklehr]

I've since rewritten the sync algorithm to avoid this kind of problems. Head over to #666 if you'd like to help test the new version.

[fredbcode]

This bug still present on 4.4.6, tested with url (not webdav link) nextcloud 20.0.1, Firefox 82.0.2
E020: Impossible de lire la réponse du serveur. L'application de marque-pages est elle installée sur votre serveur? JSON.parse: unexpected character at line 1 column 1 of the JSON data

[fredbcode]

Right now I also note that sub directories are duplicated at each synchronization

[tchap2]

@tchap2 Do you still experience this issue?

Hello, YES! The issue is still there.
After not using Floccus for ~6 months, I again downloaded the addon to Firefox, set up the account (to root folder), and I again received error (below is verbatim from debug logs, the addon shows a shorter version of that error) - this is the only error:

2020-11-13T16:17:27.039Z { [Error: 1 errors]
list:
[ [Error: E020: Could not parse server response. Is the bookmarks app installed on your server?
JSON.parse: unexpected character at line 1 column 1 of the JSON data] ] }
2020-11-13T16:17:27.040Z [Error: E020: Could not parse server response. Is the bookmarks app installed on your server?
JSON.parse: unexpected character at line 1 column 1 of the JSON data]
2020-11-13T16:17:27.041Z Syncing failed with E020: Could not parse server response. Is the bookmarks app installed on your server?
JSON.parse: unexpected character at line 1 column 1 of the JSON data

Where is this JSON file located (firefox browser, one of my bookmarks http address, nexcloud server?) What is the unexpected character?

I do see that some boomarks where synced, because bookmarks folder on nextcloud server shows these. Log file shows that all bookmarks have been processed and assigned an ID starting with "-#" and also ending with "parentId"

I also tried setting up account as "Nextcloud Bookmarks (legacy)" and when I select radio button and click on "Add Account" nothing happens! I cannot proceed at all. Why? (my firefox is on auto-update, so whatever the latest firefox version is, that version is on my desktop).

All of above problems started happening I believe in Feb/March this year when completely redesigned version of Floccus was released.

BTW, when I set up floccus on Brave browser I get error
Nextcloud API error: {"status":"error","data":"Could not find folder"} Trying to insert an already existing item into OrderTracker: bookmark:1937 E020: Could not parse server response. Is the bookmarks app installed on your server? Unexpected token < in JSON at position 0

[tchap2]

I am not sure if this is directly helpful but I am going to post in case it's useful to someone else who is a bit dense like me and searches for it.

Also got e020 on new install. Content of the logs was basically

Starting sync process for account nextcloud@host.com
Using normal strategy
Fetching bookmarks
Syncing failed with E020: Could not parse server response. Is the bookmarks app installed on your server?
JSON.parse: unexpected character at line 1 column 1 of the JSON data

The solution:

In the field labeled nextcloud URL you put the URL of the nextcloud, not the webDAV URL

https://nextcloud.host.com/ not https://nextcloud.host.com/remote.php/dav/files/user/

floccus is clever enough to figure out the rest.

This is exactly what was done. This does not change the issue nor this ticket.

[marcohald]

I also have this issue with Nextcloud 20.0.2 , Bookmarks 4.0.5 and floccus 4.4.6

2020-11-23T09:25:12.003Z Syncing failed with E020: Antwort des Servers konnte nicht gelesen werden. Ist die Bookmarks App auf Ihrem Server installiert?
JSON.parse: unexpected character at line 1 column 1 of the JSON data

I tried this #666 (comment)

• Deduplicate shared bookmark folders
  • Removed 0 duplicate shares
• Remove superfluous shared bookmark folders
  • Removed 0 superfluous shares
• Remove orphaned bookmark shares
  • Removed 0 orphaned shares
  • Removed 0 orphaned public links
• Remove orphaned bookmark tree items
  • Removed 228 orphaned bookmarks entries
  • Removed 0 orphaned folders entries
  • Removed 42 orphaned children entries
  • Removed 0 orphaned bookmark folders
  • Removed 0 orphaned bookmarks
• Update bookmark group shares
  • Removed 0 users and added 0 users to 0 groups
  • Removed 0 shares

But still receive this error.

[marcohald]

I debugged it via about:debugging and saw that a bad response from our Reverse Proxy was cached fro the URL index.php/apps/bookmarks/public/rest/v2/folder?root=-1&layers=0
I right clicked my Nextcloud Site on the Firefox history and deleted it via forget this site.
Now it works again.

[fredbcode]

No reverse here and floccus is unfortunately unusable in my case
Do you have directories in your bookmarks ? Maybe ( #641 (comment) ) is a glue about this issue ?