mdldecompiler "Unable to load model"

I can’t decompile any models with cannonfodder’s MDL decompiler, it just says unable to load model. Is there a way to fix this?

Try using Crowbar.

okay i was going through previous fixes, and managed to get it to work, so i have fixed my world model and everything right? now when i open up Half Life Model Viewer to fix the muzzle attachment, there is no muzzle attachment under attachment…