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Anki synchronization problem, error code included in message


I hope someone can help me out.
When I want to synchronize my Anki I get the error code which is shown below. I have tried everything, reinstalling, disable add-ons, database checks but nothing seems to help.

Anki 2.1.35 (84dcaa86) Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2021-02-20 14:21:53

Caught exception:
Traceback (most recent call last):
File “aqt\”, line 87, in _on_closures_pending
File “aqt\”, line 59, in
File “aqt\”, line 76, in wrapped_done
File “aqt\”, line 101, in on_future_done
File “anki\”, line 34, in begin
File “anki\”, line 229, in db_begin
File “anki\”, line 244, in _db_command
anki.rsbackend.DBError: DBError { info: “SqliteFailure(Error { code: Unknown, extended_code: 1 }, Some(“cannot start a transaction within a transaction”))”, kind: Other }

Thanks in advance

Have a great day


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