Encountered AttributeError: 'Permission' object has no attribute '_revisions' after upgrading Wagtail from 2.6.2 to 4.0.1 - wagtail

I encountered the following error when accessing Pages in Wagtail Admin:
File "C:\Users\env\lib\site-packages\wagtail\models_init_.py", line 983, in revisions
return self.specific_deferred._revisions
AttributeError: 'Permission' object has no attribute '_revisions'
It seems to be some conflicts in the wagtail model that caused the error, and it only occured after I upgrade wagtail from ver. 2.6.1 to 4.0.1.
Thanks

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