I keep receiving the below error whenever I attempt to check a hands on challenge. I have logged in and out multiple times and get this error in multiple trailhead boxes.

There was an unhandled exception. Please reference ID: TBRSCDKH. Error: Restforce::UnauthorizedError. Message: INVALID_SESSION_ID: Session expired or invalid

Hello,

Part of the module is where you create couple of profiles with object level permissions. Accordingly i have set the right permissions for account object (R/E/VA), Opportunity (R/C/E) -- NO VIEW ALL for Field Sales Profile.

Everytime i check the challenge am getting below error; any help.
Error:
Challenge Not yet complete... here's what's wrong: 
The Field Sales User does not appear to have the correct object permissions for Accounts and Opportunities.