Simply cannot export compatible models from Blender 2.74

[sycon senti]

I've tried everything. I've made sure all of my models are constructed from triangular polygons, exporting a simple sphere, editing an actual in game model and even just importing a model from the game into Blender and exporting it to a separate folder without editing a thing. Yet every time I get this error:

FATAL ERROR: Created material 'C:/Program Files (x86)/Steam/steamapps/common/Amnesia The Dark Descent/entities/folder/model/' could not be loaded!

I'm guessing this means none of the models that have been run through Blender are compatible, but I don;t know why this could be as sometimes I haven't even edited them.

Thanks is advance for your help.