environment map error help

[BSUGeek]

Here is my code. I keep getting an error "Failed to load texture: 'space1_posx.jpg" I don't understand what's happening. When i run it I just get a grey screen but I'm trying to get an outer space sky.

import viz
viz.go()

#Add Sky
env = viz.add(viz.ENVIRONMENT_MAP,'space1.jpg')
sky = viz.add('skydome.dlc')
sky.texture(env)