Error 319 generally relates to "problems with VOD program missing". It's usually resolved by VM fixing/reloading the missing program... although it could be potentially indicative of general VOD problems with your box. (i.e. it sees every program as "missing")
Presumably you're having this error message on certain programs.. in which case, what are they? One of the other users on here may be able to check the program and see if it works... which could help prove that it would need reporting to VM.