I can't open experiment file:AttributeError: 'NoneType' object has no attribute 'attributes'

-I can’t open the experiment file that was working perfectly just 2 hours ago->I tried reinstalling Psychopy, didn’t work,there is no hidden .git folders, and no experiment file in Pavlovia : -I get: Traceback (most recent call last):
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/projects/pavlovia.py”, line 620, in getitem
KeyError: ‘path_with_namespace’

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/_psychopyApp.py”, line 912, in MacOpenFile
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/_psychopyApp.py”, line 848, in newBuilderFrame
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/builder/builder.py”, line 184, in init
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/builder/builder.py”, line 4622, in init
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/ribbon.py”, line 155, in addPavloviaProjectCtrl
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/ribbon.py”, line 356, in addPavloviaProjectCtrl
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/ribbon.py”, line 801, in init
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/app/ribbon.py”, line 851, in update info
File “/Applications/PsychoPy.app/Contents/Resources/lib/python3.8/psychopy/projects/pavlovia.py”, line 622, in getitem
AttributeError: ‘NoneType’ object has no attribute ‘attributes’ — how can I fix this?

Thanks!

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