How do i set Weld Active to false?

I have this script that i am making for VSB. What this means is that everything has to be made using a script.

I am making this gauntlet, and i want to weld them together to the LeftArm of the player(R6)

I am settings Weld.Active to false using this simple script:

weld.Active = false

"weld" is, ofcourse, a variable for the weld.

However, whenever i test the script this error pops up:

17:18:55.187 - can't set value

I don't know how to fix that, i've seen plugins use it so it has to be possible right? Any help is appreciated. Thanks.