EVERY block i make shows up as a missing texture

Before, it was perfectly fine. I have a plugin that gives me world edit, i tried using it, regenerated code or whatever, and suddenly, EVERY SINGLE block does not have a texture. i tried making new ones, it didn't work. i tried making new textures, didn't work. i have a block with a custom model, that texture isn't working either. however, my 3d models weapons and armor work, so i know for a fact that it cant be anything related to the textures. and i hope someone responds because I'm absolutely sick of nobody answering me.