The model was missing a texture, and that's why the export failed.
After adding a texture, the model exported fine.
You can add texture to the model using this method:
You also need to rotate your model to 0,0,0 degrees before exporting to md5.
Here is the final result (without view source):
www.gamemaker3d.com/player?pid=01660077
Regards,
Cyberix3D team