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Abhirup MukherjeeAbhirup Mukherjee 

App Customisation Specialist Superbadge: Step 2 error

Hello All, 

I am trying to complete the "App Customisation Specialist Superbadge" while I have completed the requirements as stated in step 2. I am facing the below error while validating the challenge in step 2. 

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: IRXZDZDI"

Can anyone help me in this!? 
Thanks.