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hamdy fadhlounhamdy fadhloun 

Trailhead error id: OZXVVKJM

Hello Experts 

I tried to verify one of the trailhead " Battle station" 
and i got this error 
please can you help ? 

Thank you 
Step 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: OZXVVKJM 
Remarque : Si vous avez ignoré les étapes précédentes, vous risquez de rencontrer des erreurs.
Jeff Douglas (Personal)Jeff Douglas (Personal)
Does your org use a namespace by any chance? We don't support namespaces for Trailhead.

If not, which step are you getting the error on?

Jeff Douglas
Trailhead Developer Advocate