Access denied error while editing SharePoint 2013 List item.

While editing an item in a SharePoint 2013 List, I faced this error: "Access denied. You do not have permission to perform this action or access this resource" although the user has already an edit permission!!! 

I checked the ULS logs and the exception was "Original error: System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"

After alot of searching, the solution was so simple, go to List settings > Advanced settings, and in the "Item-level Permissions" field, change "Create and Edit access:   Specify which items users are allowed to create and edit" to " Create and edit all items  " ... then save

So Simple ... huh ?!