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Marlie WijnandsMarlie Wijnands 

unexpected error ID AWPEMDRF

I get unexpected error while verifying a challenge, due to some pre-existing configuration or code in the challenge Org.  reference error id: AWPEMDRF. I already deleted cache and created 2 times a new org. It does not help.
VinayVinay (Salesforce Developers) 
Hi,

You can reach out to Trailhead team who can help you with these issues using the below link.

Support:https://trailhead.salesforce.com/help

Thanks,