Uncaught Javascript error on load for some users

[burnnat]

See screenshot of the exact error message:

Uncaught Error: Authorization is required to perform that action.
Transport Error: There was an error during the transport or processing of this request. Error code = 10, Path = /wardeninit

Similar error reports for the FormMule addon for Google Sheets indicate the problem may be related to users logged into multiple accounts simultaneously:

I think the issue is that I'm logged into multiple google accounts when I am working on this. I logged out of all google accounts, then only logged into the one account that I was trying to use formMule and it worked.