It seems to indicate a problem with one of your deck names, but I can't see the problem in your AnkiWeb collection. If you're still having issues, can you reproduce them after updating to the latest Anki version?
I just updated anki on my mac to version 2.1.19 and I got a similar looking error.
Traceback (most recent call last):
File "aqt/sync.py", line 449, in _sync
File "aqt/sync.py", line 429, in _abortingSync
File "anki/sync.py", line 140, in sync
File "anki/sync.py", line 222, in sanityCheck
File "anki/sched.py", line 54, in reset
File "anki/sched.py", line 808, in _resetRev
File "anki/sched.py", line 805, in _resetRevCount
File "anki/sched.py", line 205, in _walkingCount
File "anki/decks.py", line 588, in parents
Please force a one way sync in the preferences screen, choosing upload or download depending on which side you want to keep. If you choose to upload, please let me know after you've done so and I'll take a look at your collection. If you download, it shouldn't need my intervention as AnkiWeb appears ok.