Zombie sweps messed up gmod

A few days ago i downloaded this:

i installed it the correct way and it doesnt work.
but then after that my other sweps didnt work and when ever i tried to fire them there would be a message up in the top right corner of the screen that said:
“obj_weapon_extend.lua:20: stack overflow”

the only sweps that work are the chainsaw gun v2 and the cluster and mach nuke.

oh and also, my camera turned into a pistol, so whenever i take a screenshot, there is a pistol in mid shot there for some reason.

I had a similar problem. My SMG model turned into a purple and black textured MA5B from Halo, and my toolgun turned into a fucking strider cannon.

Just delete the SWEPs.