The page you are trying to access requires a valid ITC Passport token.
This usually means that your ITC Passport token has expired.
If you originally accessed the ITC Passport system through D2L use the link in your D2L course again to access the ITC Passport system which will refresh your token and then try accessing the site again.
If you are an outside user with an ITC Passport local login enter your credentials on the ITC passport local login page which will refresh your token and then try accessing the site again.
Contact your instructor if you continue to have issues.