Script / hotkey to switch to Fusion Fullscreen

Just upgraded to Yosemite and Fusion 7 from Mavericks and Fusion 6. I have a script (which I think I saw here some time ago) that previously would switch me to a Fusion fullscreen:-

tell application "VMware Fusion"

  activate

  set c to "Windows 8 x 32 (was XP Home Edition VLS Product Key)"

  set thiswinID to (get id of item 1 of (get every window whose name contains c))

  set index of window id thiswinID to 1

end tell

I'm now getting an error message "error "VMware Fusion got an error: Can’t get every window whose name contains \"Windows 8 x 32 (was XP Home Edition VLS Product Key)\"." number -1728"

"Windows 8 x 32 (was XP Home Edition VLS Product Key): is the Virtual Machine name

I've not been able to track down that error code as yet, but does anyone have an idea why the script no longer runs?

Thanks for any thoughts

Jim