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Error!!!!
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: KFHVIYKQ
If your challenge involves reports and dashboards, you may get this error when you have made some changes in report and did not refresh the dashboard.Try to refresh the dashboard and then check for challenge.
If this does not work for you, post the link of the challenge you are trying so that I can help you further.
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards
Sandhya