syncing error "Exception: Unknown response code: 400"

Hi, I get the following error when trying to sync anki, does anyone know what the issue is and how to fix it?

Syncing failed:
Traceback (most recent call last):
File “aqt/sync.py”, line 429, in _sync
File “aqt/sync.py”, line 409, in _abortingSync
File “anki/sync.py”, line 138, in sync
File “anki/sync.py”, line 617, in sanityCheck2
File “anki/sync.py”, line 627, in _run
File “anki/sync.py”, line 554, in req
File “anki/sync.py”, line 487, in assertOk
Exception: Unknown response code: 400

Please see When problems occur - Frequently Asked Questions

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