Provide a user-friendly message for SAML users who do not authenticate correctly due to an incorrect/incomplete SAML response

When the SAML role (used to assign privilege levels in Netreo) of user is not specified in the SAML response for a user and that user attempts to log in, the user is unable to log in and Netreo will display "An internal server error has occurred". (see attached).

Would be best if there was a more user-friendly error that says that the user was unable to log in with a brief explanation as to why the user was unable to log in instead of the system error that is currently shown.