Problem with anki, need help please

I have this issue that i don’t know how to solve, each time i try to open anki it shows this:

Anki was unable to open your collection file. If problems persist after restarting your computer, please use the Open Backup button in the profile manager.

Debug info:
Traceback (most recent call last):
File “aqt/”, line 441, in loadCollection
File “aqt/”, line 467, in _loadCollection
File “aqt/”, line 588, in moveToState
File “aqt/”, line 595, in _deckBrowserState
File “aqt/”, line 54, in show
File “aqt/”, line 110, in _renderPage
File “aqt/”, line 117, in __renderPage
File “</Applications/>”, line 2, in renderStats
File “anki/”, line 666, in decorator_wrapper
File “anki/”, line 663, in repl
File “/Users/admin/Library/Application Support/Anki2/addons21/1556734708/”, line 71, in renderStats
+ _old(self) + “

File “/Users/admin/Library/Application Support/Anki2/addons21/1421528223/”, line 9, in renderStats
nodes =
AttributeError: ‘Scheduler’ object has no attribute ‘deck_due_tree’


  1. update Anki to latest version.
  2. If problem still exists, report to add-on author.
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