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apoorva k basavarajapoorva k basavaraj 

please post to the developer forums and reference error id: IHTQBYOS

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: IHTQBYOS
apoorva k basavarajapoorva k basavaraj
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: KAOLWKWK
Raj VakatiRaj Vakati
Can you check debug logs to see is there any error ? 

Or create new org and try 
apoorva k basavarajapoorva k basavaraj

Raj,

 

Thanks for suggestion, I was not able to trace anything from debug logs. I have already been using the TrailHead in same SF dev account and I dont want to try for new Org.
 

SandhyaSandhya (Salesforce Developers) 
Hi,

If your challenge involves reports or dasboards, 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.

Post the link of the challenge you are trying so that I can help you furrher.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya