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Abhi MalikAbhi Malik 

Error in building conference management app

There was an unhandled exception. Please reference ID: EMRPTZQO. Error: Faraday::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist 
Note: you may run into errors if you've skipped previous steps.
Best Answer chosen by Abhi Malik
DeepthiDeepthi (Salesforce Developers) 
Hi Abhi,

Please check if you have namespace setup in your org as this might be causing the issue.Due to the namespace, the API names will be appended with namespace and hence it is not verifying your results. And Trailhead doesn't support namesapced DE accounts. Try to create a new DE account and proceed working on the challenges.

You can get your badges added to your existing account by working on the new DE account. Please refer the below link for more details:
https://developer.salesforce.com/forums/ForumsMain?id=906F00000005JciIAE

Hope this helps you!
Best Regards,
Deepthi