Bad mods or doing something wrong?

I’ve installed a load of mods, many of them work, many of them don’t. But after a while I noticed the zombie torso is now a big ERROR and some of my gun pack gunsounds don’t work. Also other things like materials that HAD been working on a map earlier, have now disappeared. Really not sure what to do to fix this stuff.

I’ve been struggling to figure out why some of these mods will not work. I install them in the right place, and hear about so many others being able to use them, but…they don’t show up for some reason.

I’m just totally comfused and have no idea how to fix any of this stuff. Any advice would be mega-appreciated.

The best thing you can do (though a pain in the ass) would be to install a mod one at a time to see what breaks and what doesn’t.