Extra Notes Window Permissions
From the sounds of the error, it appears that the user may not have access to one of the Extender Windows. This would be tha actual window it is using to build the note window, not the resource itself. If you look in the Tasks, under the product of Extender and the Type of Windows, there is operations under the Series of System, Project, and 3rd Party. These are used to access the base window that is generated with the fields setup on the resource in Extender. I would look first at ones like Window1, Add Note, and Copy Notes in the System series.
If you would like to submit an answer or comment, please sign in to the eOne portal.