When adding a new element with a new texture, it returns an error.

I'm making a mod for 2020.2 for version 1.12.2. Now I'm having a problem downloading the mod.

When adding a new texture, it is when importing that the new elements break the mod and prevent it from loading.

I checked when adding the texture that is drawn in the workspace, everything works. When importing a texture, everything breaks.

Please help me figure out this problem.