For those getting errors even after removing this:
If you had previously signed in using the same OAuth credentials, you'll have to go to "account" > "security" > "See all connections" (third party apps) and then remove the previously granted access.
This is a rewrite of the OAuth2 module to address some bugs and inconsistencies. And since it changes the structure of the credentials, I'm marking this as a breaking change.
Note that you will have to update your existing credentials, that is if you wish to continue using them. Otherwise, simply delete them and sign in again.
