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Insufficient Privileges while replying email - Case object

There are emails associated with case object. Some of the users are getting Insufficient Privileges while clicking 'Reply' button but able to forward the emails only for some records.

The profile has read, edit, create, read all access to case. 

The records for which they are giving error, tried to gave Read Write access via manual sharing. Still the users are receving the error.

What could be the reason salesforce is not letting them to reply the email but forward.

Thanks a lot in advance. 

Best Answer chosen by priyanka.mv26
SandhyaSandhya (Salesforce Developers) 

Make sure the user has access to the Contact. Found an issue where a contact on a case was created without an account by a user. Once the account was added access to contact on Case was enabled and resolved the error.
Try giving access to contact object as well.

Please refer below posts for more information.
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