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Venkatesh LVenkatesh L 

There was an unexpected error while verifying the challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. If you're using a new DE and seeing this error, post to the developer forums and reference error id: MCLQRJOF

SandhyaSandhya (Salesforce Developers) 
Hi Venkatesh lakshmaiahgari,

This error occurs if you are not using new DE org for a particular challenge.If you have used new DE org and still getting the error, then please try to log out and log in again and then check the challenge usually the error goes away this away.

And also please provide the link of trailhead module you are working so that I can help you further.

Hope this helps you!

Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.
 
Thanks and Regards
Sandhya
 
Venkatesh LVenkatesh L
How to Create a button with name Email on Lead record. When Lead record is opened and Email button is clicked it should send Email to Email value present in the lead record. If the lead record consists of any attachment records in the related list then attach it to the email being sent.