Okay, I don't know anything about this camera, but I am going to throw this out there since no one has replied to you yet. The ad you linked to indicates that it comes with an adapter for a 75mm lens and that other adapters are additional. Do you have the adapters for the 90mm and 210mm lenses? I am guessing that the adapter is necessary to bring the lens far enough away from the film plane to focus.
If that is not it, than I have no idea.