Re: Error. Exception: QDSMain.Exceptions.DistributionFailedException: Distribute failed with errors to follow. ---> System.ArgumentNullException: Value cannot be null.
Like Bill states, you will need to upgrade to be able to get support on this one.
There is always the possibility to have Distribution Service (QDS) on Debug logging and trying to figure it out by looking at the log rows preceeding the error. Also look at the general log files for QDS to spot other errors or warnings.