I am getting the below error while completion of this challenge for "Customize Compact Layouts" in "Salesforce Mobile App Customization" for "Admin Begginer". Kindly help in resolving asap so that i can proceed further.

Error : 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: AZYGIFCT