GBitmap::getWidth: mip level out of range (0, 0)

GBitmap::getWidth: mip level out of range (0, 0)

I get this CTD error when trying to add custom interiors (with new materials).

Any idea what this means so I know where to go to fix what I did wrong? (Pretty sure it's something I did here...)


Edit: Just tried adding a 1-Texture simple cube and had the same problem. Is this a texture thing? The textures I'm using are .jpgs are the moment.

2nd Edit: Same error with using .png files. :( Wtf am I doing wrong?

I have this for the texture in materials.cs

datablock Material(cm_1)
{
   baseTex[0] = "~/data/interiors/tim_test/cm_1";
   bumpTex[0] = "~/data/interiors/tim_test/cm_1_bump";

   pixelSpecular[0] = true;
   specular[0] = "1.0 1.0 1.0 0.1";
   specularPower[0] = 32.0;
};

And this in materialMap.cs:

addMaterialMapping("cm_1", "material: cm_1");