Hello,
Zoom itself has nothing to do with the JAWS scripts and key bindings.
I suggest you go into the keyboard manager and see if you can find the script listed there that you are trying to execute, and then rebind the keystroke if you do. To open the keyboard manager, press insert-F2 and find the keyboard manager listed there. There is a list of applications, make sure you are in the Zoom application, and then review the lists of scripts available for assigning keys to. There is a way to filter out the default scripts to limit the list. I believe the keyboard manager is driven by the ".jsd" files so if there is an error in the JAWS builtin documentation then it is possible to still get this error, but would be a big priority and fairly simple for Freedom Scientific to correct.

Otherwise, you could purchase or perhaps sample Brian Hartgen excellent and often updated scripts. I have heard very good things about these scripts, but have not tried them since I primarily use Zoom on Apple products.
Brian's web site is:

http://www.hartgen.org/zoompro
Another thing you can check is to see if you have a zoom.jkm file or something closely similar to that in your JAWS private settings files. TO To get to this, from the start menu search for Utilities JAWS , this will bring up a directory listing of several shortcuts. Select the Explore My Settings shortcut and then look for files that start with Zoom. These are customizations to zoom that were added to you that are not part of the JAWS installation and would override anything in the JAWS directories that gets checked when you repair JAWS.

Best Wishes,
Jonathan