If you see this error message, then the login process did not finish correctly.
Normally this means, that the Browser could not finish your login request securely.
Try one of the following:
- Load the login page again in a new browser window and login.
- Do not click somewhere while the login is running, and do not switch browser tabs/applications windows.
- Try logging in via a different login method (e.g. if you are using the "Google Login", try a password based login with the same e-mail address)
- Clear your browser cache and try again.