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영석 서영석 서 

We can't verify that email-to-case was enabled.

I try Project "Set-up Salesforce Knowledge >Manage Cases Using Articles". 
but, I got the error message as below.
help me.

User-added image
We can't verify that email-to-case was enabled.
영석 서영석 서
here is link : https://trailhead.salesforce.com/content/learn/projects/set-up-salesforce-knowledge/manage-cases-using-articles
AbhishekAbhishek (Salesforce Developers) 
Hi,

For all the Trailhead issues please report it here,

https://trailhead.salesforce.com/help?support=home#

So that our trailhead support engineers will look into it and get back to you.

I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.

Regards,
​​​​​​​Salesforce Support.