From your error message description, it sounds like you're using the DP2SceneGraphWizard I wrote (it's in my signature below). If this is the case, I'll be glad to answer your questions/issues on the GitHub site below. Support is not provided on this forum.
FREE Windows desktop software for converting Direct Publisher channels to SceneGraph (SDK), for creating
BIF (Trick Play) files,
Roku (MRSS, JSON) feed files, and
FireTV feed files @
GitHub/rrirower.