3d Weapon texture won't save

Hello. I have made a 3d model with a json file of a sword, and I put it on MCreator with no problems, but then I tried to make a texture for the sword. The texture was just a default texture from blockbench I edited, so to my knowledge it should work when I upload it. So I upload the texture to the model (which is now an item I already made) and I click save mod element, but in game it comes out as a black and purple texture. (The entire model is black but the bottom cube, which comes out lavenderish purple) All my other textures and 3d models work but this one.