Impossible to use anymore

Hello !

I can not synchronise my anki from my macbook anymore. I cant’ go throw the cards either.

The message says :
Anki 2.1.15 (442df9d6) Python 3.6.7 Qt 5.12.1 PyQt 5.11.3
Platform: Mac 10.12.6
Flags: frz=True ao=False sv=1

Caught exception:
File “aqt/”, line 27, in cmd
File “aqt/”, line 87, in _onCmd
File “aqt/”, line 368, in _onBridgeCmd
File “aqt/”, line 56, in _linkHandler
File “aqt/”, line 80, in _syncLinkHandler
File “aqt/”, line 690, in onSync
File “aqt/”, line 379, in unloadCollection
File “aqt/”, line 632, in closeAllWindows
File “aqt/”, line 114, in closeAll
File “aqt/”, line 525, in closeWithCallback
File “aqt/”, line 351, in saveNow
<class ‘AttributeError’>: ‘NoneType’ object has no attribute ‘evalWithCallback’

Please help me

Please see