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I've finished my class to load and display .obj files. It works on some models but doesn't work on anything I export and I get a rather strange error:

Code:

Traceback (most recent call last):
  File "/Users/Elephant_Inc/Desktop/bpwpapcode/Chapter11/tankdemo.py", line 92, in <module>
    run()
  File "/Users/Elephant_Inc/Desktop/bpwpapcode/Chapter11/tankdemo.py", line 64, in run
    tank_model.read_obj('elephanilla.obj')
  File "/Users/Elephant_Inc/Desktop/bpwpapcode/Chapter11/model3d.py", line 120, in read_obj
    texture_path = os.path.join(model_path, material.texture_fname)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/posixpath.py", line 60, in join
    if b.startswith('/'):
AttributeError: 'NoneType' object has no attribute 'startswith'

I've triangulated the mesh (I have a thing in the program to check for that anyway). Does anyone know what the cause could be?