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Jean-Noel CasassusJean-Noel Casassus 

Trailhead: Sales Reports for Lightning Experience

From a brand new dev org, here is issue I'm facing with challenge 3

Challenge Not yet complete... here's what's wrong: 
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: AFYRHOYT
SandhyaSandhya (Salesforce Developers) 
Hi Jean-Noel Casassus​,

Please refer below links and see if you can get any information since this error is not appropriate.You may get this error even if you  have done something wrong in your challenge.

Hope this helps you!

Thanks and Regards