Anki not syncing after updating cards

Hi there,

Hope everyone is well. I was wondering if anyone could help me understand why my anki isnt syncing?
Below is the error message:

Syncing failed:
Traceback (most recent call last):
File “aqt/”, line 429, in _sync
File “aqt/”, line 409, in _abortingSync
File “anki/”, line 137, in sync
File “anki/”, line 219, in sanityCheck
File “anki/”, line 68, in reset
File “anki/”, line 556, in _resetRev
File “</Applications/>”, line 2, in _resetRevCount
File “anki/”, line 666, in decorator_wrapper
File “anki/”, line 663, in repl
File “/Users//Library/Application Support/Anki2/addons21/1460733408/”, line 163, in resetRevCount
return _old(sched)
File “anki/”, line 553, in _resetRevCount
File “anki/”, line 213, in _walkingCount
File “anki/”, line 630, in parents
KeyError: ‘AnKing::Zanki Step Decks::Zanki Respiratory’

Please follow the steps on

Thank you! I ended up at check database and the message I got was that I had 4059 new cards with due > 1,000,000 and to consider repositioning them in the browse screen. Do I have to actually do anything here or is that just a suggestion?

Btw, the syncing problem did go away after clicking check database! I’m just worried it may come back again if I don’t do anything else?

If you find it crops up again after updating to the latest Anki version, please let me know the steps you’re taking that trigger it.