In the format reports module.I am trying to create a summary report on cases with fields case owner ,subject,Account name.

I did the same and during validation it is always raising the error:
Challenge Not yet complete... here's what's wrong:
The 'Case Status' report does not include the 'Case Owner' field.

Hello,

I'm having trouble checking the challenge, I've checked other discussions and I've done exactly what others have done to pass but everytime I click check challange it gives me this error message:

Looks like something went wrong, please try again later.

I've logged out of both Developer Edition and Trailhead acc, used another new Developer Edition to redo the challenge and it gives me the same message.