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Theresa EngelkenTheresa Engelken 

I'm having an issue checking a challenge on my trailhead

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: THWUNBKI
Pramod Vasudeva Murthy 14Pramod Vasudeva Murthy 14
Could you please share which trailhead you are trying on? It is quite difficult to judge from the error description and also share what you have tried so far so we can count out a few alternatives.

~VIP
Deepali KulshresthaDeepali Kulshrestha
Hi Theresa,

Please refer to this link below:
https://developer.salesforce.com/forums/?id=906F0000000AzQdIAK

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