I am completing the App Customization Specialist superbadge and when i checked for the step 2 challenge the following error occured-

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: MXHDPYAI

Any help regarding this matter is appreciable.
Thanks And Reagrds
Prajwal Joshi