LUA Toolgun Errors

I’m on Garry’s Mod in singleplayer working on my buggy, after awhile my tools seem to take a shit, giving me LUA Errors. First I could not use my No-Collide Multi tool, now it seems that 4 others have broke. I also tried using a wire tool, where I get the same exact LUA Error.
Here they are.

weapons\gmod_tool\stool.lua:92: attempt to index a nil value

As for the No-Collide Multi error, I get this.

weapons\gmod_tool\stools/no_collide_multi.lua:109: Tried to use a NULL entity!

Can someone help me please? Thanks :D.