Problems with my Pioneer A05... please help



I’m trying to burn a DVD movie using Nero 6 Ultra Edition but I keep getting an error saying “Blank command check error. Pioneer DVD-RW DVR-105\H2 T0”. I am currently using Princo 4X DVD-Rs but burning at 2X. Can anyone tell me what this error means and whether this is a nero, pioneer or DVD media related problem.

Thank you.