In said test map, I've manually "copied" the Triggers one by one in a new map. and again only this "TurnShootercontrolsonoff" trigger (I do believe I mistakingly called a Script(?)) is the one is causing the problems. Which I have mentioned I have disabled to be able to save my Test Map. The only other thing I would guess is the Dependency Library is where this would be in maybe which I can't seem to be able to edit at all.
The script looks like it's needed to be able to launch/save, since the TPS gameplay doesn't trigger without the script.
I've tried checking around and seeing if I could find what this "Invalid Parameter, possibly an incorrect variable name" is, but so far I've come up with not much unterstood on my part. Maybe I should give it a nights rest for now.
And maybe it's simply because some updates broke the Triggers if edited in the map or something? I can't see what's wrong yet the editor is trying to highlight this script. The Map and Library are from 2013 after all.