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Swee Yung LeeSwee Yung Lee 

(Trailhead) Unable to complete challenge for Advanced Formulas: Leveling Up with Advanced Formulas

Hi there,

I try to complete this challenge, (https://developer.salesforce.com/trailhead/advanced_formulas/implementing_advanced_formulas)
but I get this error message:
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: ZVPWNITN

I tried with clean Developer edition too, but I get the same error.

I hope this issue will be fix soon.

Regards,
Swee Yung, Lee