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Guneet Saini 2Guneet Saini 2 

Superbadage : App Customization Specialist

Hello all, I am using new DE to complete superbadage but still got this error with reference error id: UAUJXCDR
SwethaSwetha (Salesforce Developers) 
HI Guneet,
The error is similar to GACK ID in salesforce. Most of the time, these go away when you try the challenge in a new playground or keep trying multiple times. If the error still persists, please use the below link to reach out to the Trailhead Support team so that one of the Engineers will get in touch with you and assist further.

Support Link: https://trailhead.salesforce.com/en/help?support=home

Please mark this answer as best if it helps so that others facing same issue will find it useful. Thanks