The error you are seeing will occur when you do not have an Identity Provider configured for the project and you attempt to sign in. It shouldn’t break your project - just avoid signing in for now. If the project will not let you in unless you login, then make sure the Public security level is selected in the Perspective Project Properties in the Designer.
We are on the home stretch for finishing the Security Levels and Identity Providers gateway config UIs - we are targeting to merge it into the beta within the next week.