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venkatesh Reddy 20 GBSWGINA
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QEUYXEZB
Sorry for this issue you are facing.
May I request you please confirm which trailhead module are you working on?
There are few trailhead challenges where you have to use brand new developer org's to pass the challenge successfully. Please make sure you are using a brand new dev org in order to validate this challenge.
You probably get this error, because your session has expired.
Please try to log out of your DE (in trailhead, not the org) and reconnect your DE to a trailhead. Then, please re-check the challenge. It should pass now.
Still, if the problem persists can you please double check that your Developer Edition Org does not have any namespaces setup in it? Trailhead does not support namespaced DE Orgs and so if you have a namespace registered for the DE Org, you'll need to sign up for a new one and complete this module there.
Please let us know whether you are performing the challenge in trailhead playground or developer org?
Hope this helps.
Please mark this as solved if the information helps so that it gets removed from the unanswered queue which results in helping others who are encountering a similar issue.
Thanks,
Nagendra