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Sorna JenefaSorna Jenefa 

Trailhead Error-Customize Compact Layouts


Customize Compact Layouts

Challenge 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: UHKOWMOX

I have also try in new DE ...

NagendraNagendra (Salesforce Developers) 
Hi Sorna,

Sorry for this issue you are encountering.

May I request you please confirm if you are using a brand new developer org for validating the challenge?

If you are using a brand new developer org then please double check that your org doesn't have a namespace enabled.If that doesn't help please give a try by restarting the batch

Still, if the problem persists log out of all accounts and log in once again in a different browser by clearing the cache and cookies which should probably do the trick.

Please let us know if this helps.

Mark this as solved if my reply was helpful.