Non killable npc's!!

whenever i get on Gmod, i can never kill any npc’s, and i cannot die from them either. can anyone help?

Did you turn the AI on? I bet you didn’t.

Do you have any mods installed?
Try cleaning gmod and if that doesn’t work reinstall.

Yes i have, still didn’t work

[editline]09:23PM[/editline]

i have pcmod and wiremod, but the problem started way befor them, and it did not work either.