Garry's Mod crashes when I attempt to spawn a L4D prop.

I’m not sure where this came from, but whenever I tried to spawn a prop from either L4D1 or 2 the game seems to crash as soon as I click it, I have to click to actually bring up the message that hl2.exe is not responding.

Now I know some of you are thinking “Then just use the Crash Dump site to figure things out.”. I can’t - Steam isn’t recognizing these as proper crashes for some reason.

If anyone could help me I’d be really grateful.

System Specs, Addons Installed.