This issue is related to Issue #515 's PR.

This issue successfully created an error page for redirecting users who are not authorized to display an error. However, it also produced a bug.

Signing in and signing out does not automatically redirect the user to the appropriate page.

Case examples:
If you attempt to access classes from the main page and you are not signed in, it produces an error page. If you then try to sign in again, it will sign you in but you remain on the same error page.

If you are signed in and attempt to log out (and you are not on the main page), it does not redirect you to the main page but instead takes you to the error page.