Whenever I try to spawn a Zombie (any zombie) it spawns a error sign. But I can kill the error sign and it will still spawn a headcrab sometimes (they look fine too) I don’t have HL2 but I never needed it as it used to work before. A reinstall will take forever as I have over 200 addons, even though some don’t work.
Verify your game (Properties -> Updates). One of your addons might be causing this; if they’re legacy addons, try removing them to see if it fixes the issue. If it does, than you know one is causing the issue. If they’re workshop, disable them.
Thanks! Turns out it is one of the addons, as when I disabled them all, I could see the zombies. Thanks for your help!