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Varsha JethwaniVarsha Jethwani 

Improve Data Quality for Your Sales and Support Teams Create a Process with Process Builder

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: RGEVUAPB

Even after using new Org i faced same issue, please help me to resolve the problem. 
Thanks in advance.

cheers
 
SwethaSwetha (Salesforce Developers) 
HI Varsha,
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