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Mariam Qasim 3Mariam Qasim 3 

I have this error, could anyone help? Im working on Customize Compact Layouts - reference error id: XKKISFJP


*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: XKKISFJP*
Raj VakatiRaj Vakati
Refer this link 

https://developer.salesforce.com/forums/?id=9060G000000I1zEQAS
https://developer.salesforce.com/forums/?id=906F0000000BTYNIA4
https://salesforce.stackexchange.com/questions/127859/compact-layout-for-an-object-not-getting-assigned-to-that-object
https://force.desk.com/customer/en/portal/articles/2896478-salesforce-mobile-app-customization-trailhead-challenge-help?b_id=13478