When a user logs a incident they receive the the below privilege error message. When trying to search for the privilege it can not be found under the system module.
The issue here is that the error shows the name of object whereas in the privilege section it shows the Title of the object and hence causes confusion
The privilege you need is Modules-System-Non Process related Objects and for Message tick the create privilege. You might be required to do a IISreset to refresh the cache in IIS. (not the same the client side caching on your local client machine)