I copied the piece of code from https://github.com/salesforceidentity/IdentityTrail-Module3 which is Module3RegistrationHandler.cls.
I then referenced Module3RegistrationHandler.cls in the Auth Provider for Google, but I still get the error.
I am not sure what the issue could be.
2 answers
User error. I used the same email address for google that I had already used for the facebook login. Both were using the same email address. Once I used to a different email address for google it worked. Just needed to step away for a minute. lol