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lakshya agrawallakshya agrawal 

when an internal requester goes to the googler portal and tries to add a "New Comment" on a closed case, there is an error message and they are unable to add a new comment.Error message="this case is already closed .please click the"new case"button.

SwethaSwetha (Salesforce Developers) 
HI lakshya,
Your ask is not clear. Can you elaborate on what you are trying to accomplish? Thx
lakshya agrawallakshya agrawal
I am saying that there is a status field on a case object, the status field is set to close. on closed status, the user tries an add a new comment so it needs to show the error message "this case is already closed .please click the"new case" button. Or you can refer from below image:-
User-added image