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Tushar Singh 23Tushar Singh 23 

There was an unhandled exception. Please reference ID: YTJIJSZO

Getting this error while verifying for the Apex Basics Chalenge.
There was an unhandled exception. Please reference ID: YTJIJSZO. Error: Restforce::UnauthorizedError. Message: INVALID_SESSION_ID: Session expired or invalid
SwethaSwetha (Salesforce Developers) 
HI Tushar,
I have seen users who reported similar errors.

The error is similar to GACK ID in salesforce.Most of the times, these go away when you try the challenge in a new playground or keep trying multiple times. If the error still persists, please use the below link to reach out to the Trailhead Support team so that one of the Engineers will get in touch with you and assist further.
Support Link:

Please mark this answer as best if it helps so that others facing same issue will find it useful. Thanks
Malika Pathak 9Malika Pathak 9

Hi Tushar,

you can resolve this issue by using this:

Clear your browser cache or try in different browser..
Please close all tab login again and try again


Please mark it as best answer if it helps!