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Jamie AriasJamie Arias 

Customize Compact Layouts - unable to complete challenge

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: SAAHTAIR"  I tried logging in and out and waiting a few hours I completed the task but it's not able to complete in the trailhead.
NagendraNagendra (Salesforce Developers) 
Hi Jamie,

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 it's resolved.

Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Jamie,
  • May I suggest you please check the below link for reference.

Hope it helps

Rahul Kumar