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JRJRJJRJRJ 

Trailhead error ID ZKRKBAYR

I received this 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: ZKRKBAYR"

Project:  Build a Discount Calculator
Step:  Build Logic to Determine the Right Discount to Apply

Recevied twice in two separate dev orgs.

Please advise.
 
JRJRJJRJRJ
The second dev org was brand new.