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SharathKumar ReddySharathKumar Reddy 

Getting Error "insufficient access rights on cross-reference id" on a Case record when email is sent from a Case Feed in lightning

PriyaPriya (Salesforce Developers) 
Hi SharathKumar,

To resolve the issue, we need to share the folder to the user profile by following the steps below:

In Salesforce Classic: Setup | Communication Templates | Classic Email Templates
In Lightning Experience: Gear Icon | Setup | Email | Classic Email Templates
Click the folder dropdown and locate the folder of the email template.
Click Edit.
Select This folder is accessible by all users or This folder is accessible only by the following users: and select the users through Public Groups, Roles and Territories grouping.
Move the group from Available for Sharing to Shared To.
Click Save.

Hope this is helpful!