ds file import problem

I can't get a ds file to import. The ds file has many lines...could there be a limit? I get this error: There was a problem importing application null. The ds file was created as a back-up of an application in an account that I own, but that is different from the account I want to import it into. Is it possible for Zoho reps to make this move for me? Would it be worth a try to put the app on marketplace temporarily just to get it moved over to the other account?