DVD SP4 Output troubles

Hello.
I'm working with a Mac Pro
Quad Core Intel machine with OS X 10.6.8
My work flow is this:
FC 81 minute long HDV 1080i60 sequence
Exported to QT Movie (not self contained)
Brought that into Compressor to make 90 min Best quality DVD for DVD SP4
Imported the elements into DVD SP4, deleted the menu and made the track first play.
Watched the simulation and filled out build and burn, named and saved into the folder the previous files were in. Build and burn. The DVD plays on the mac but not on a DVD player. I get this message: 'Check the disc: it may be damaged physically or may require cleaning'
What's up?
:-(
Wendell