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Deepak pal 9Deepak pal 9 

Trailhead challenge errorIf you're using a new DE and seeing this error, please post to the developer forums and reference error id: EPSDBFPB

has anybody run into this error in App customization specialist superbadge

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: EPSDBFPB
SandhyaSandhya (Salesforce Developers) 
Hi,

Make sure you have formula field for "IsShiftVolunteer" instead of checkbox.Refer below linlk for similar issue.

https://developer.salesforce.com/forums/?id=9060G0000005XMVQA2
 
https://developer.salesforce.com/forums/?id=9060G0000005XMzQAM
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya