Disabling a Save menu item

[charles61]

I have trying to devise a script to disable a Save menu item when the user is
on a certain card. My project has two sections: Student and adult. I want to
disable the Save Menu for Adult when the user is on a student card. I tried
the following and variants of it but I get an error message when I try to
compile the code:

button "File": compilation error at line 108 (Expression: double binary
operator) near "is", char 13

Here is my code in the menu bar:

 case "Save File for Student"
         if card is "adult"
         then 
            disable menuItem 2 of button File of group "menubar 1"
         end if

I have checked the RevList archives but found nothing that would help me
with this problem! Any suggestions would be greatly appreciated!
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