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vijay kumar kvijay kumar k 

salesforce mobile app customization

hi 
i'm not understand the below error when click the 'check the challenge' of salesforce mobile app customization in unit of customize campact layout.
Help me overcome this error.

--------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: EONTWHVZ--------


ThankYou
 
Best Answer chosen by vijay kumar k
SandhyaSandhya (Salesforce Developers) 
Hi,

This may be due to pre existing configuration done for other challenges.I would suggest you try in new trailhead playground.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya