I'm trying to create custom paintings and wall decorations using optifine's cit renamable items. I'm using a model to size the item correctly on the wall in the item frames, but the model only shows a texture error. The model works fine, it just doesn't have any texture.
It's a bit long, sorry. (I'm still working on updating some things so there are a lot of optifine warnings.) I removed a bit near the end because I was connected to a private server.
Ah, I should have looked more closely at the model file. Silly me.
In the model, you defined two textures designations named "0" and "particle", but then assigned a texture called "missing" to all of the faces of the model. Or more likely just didn't bother to assign a texture to any faces, and so the model editor just stuck that placeholder name in there. Either way, you'll need to go back in an assign a proper texture designation to your faces.