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Christine PrestonChristine Preston 

​​​​​​​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.

All it says is to post to the community.  Would really like to get past this & move on in training 

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: HUHTSAQP
TylerBrooksTylerBrooks
Create a new trailhead playground and redo challenge, that should solve the error.
Deepali KulshresthaDeepali Kulshrestha
Hi Christine,

If you are getting an error in challenge #7 of Lightning Experience & Dashboards Specialist Super badge.

Please refer to these links it may be helpful to you.

https://developer.salesforce.com/forums/ForumsMain?id=9060G0000005mO7QAI
https://trailheadbaby.blogspot.com/2018/09/lightning-experience-reports-dashboards_18.html
https://success.salesforce.com/apex/answers?id=9063A0000019cvEQAQ
https://success.salesforce.com/answers?id=9063A0000019h2KQAQ

I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.

Thanks and Regards,
Deepali Kulshrestha