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Tracy DyeTracy Dye 

business admin superbadge

After using the new trailhead playground only for this superbadge, and it was working fine, I got this error: 
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: QOOMLSTJ
Someone in another post said to switch back to classic and I hope that works.  This does not make sense to happen, espcailly since the dashboard needs to be in lightning in order to complete the requirement of component size.  
SandhyaSandhya (Salesforce Developers) 
Hi,

You may get this error if you have made some changes in report and did not refresh the dashboard.Try to refresh the dashboard and then check for challenge.
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya