I am not able complete this challenge duee to above message.

thanks 
Himanshu

I followed the instructions to create a macro, create a Case with subject "Design issue with mechanical rotor", and ran the Macro. The feed shows the email along with the text "The Macros Team is working on your case" in the email Body. Yet I get this message when I check the Challenge:
"Challenge Not yet complete... here's what's wrong: 
The case with the subject 'Design issue with mechanical rotor' does not includes an email update in the case feed with the text 'The Macros Team is working on your case'. Make sure you run your macro on this case."

I even created a new Case with the correct Subject with the same results.

My Email Template has the following information:
Dear {!Contact.FirstName}, 

{!Case.Solution_Description} 

The Macros Team is working on your case 

Thank you, 

{!User.Name} 
{!Organization.Name} 

Your comment: 

{!Case.Description}