adding module access in visual menu builder

[salescp]

I'm trying to add a new module to the list that a user has. In visual menu builder I click on "User/Module Maintenance", click the user and display their current modules, click a user to copy from and then select the new module and click copy. It copies the new menu over to the user, but whenever I click the save button I get the following error message "User must have Module Window".
I cannot get past this error no matter how I attempt it. Can someone please advise. Thanks.

We're running 7.6.300A - SQL

 

[salescp]

I found that I needed to add the module "Window" as well. It wasn't as obvious as it seems now because none of our other users have this module, including the supervisor. I did however, find it on the demo user.
It's a grayed out option like "File". Can anyone tell me what these grayed out ones are exactly.
Thanks.