VCD BURNING ON PIONEER DVD-RW DVR-104

[BOOOOOOM]

I HAVE TRIED TO BURN A MPEG AS A VCD ON MY PIONEER DVD-RW DVR-104 WITH NERO AND KEEP GETTING ERROR MESSAGE SAYING DISK AT ONCE CANNOT BE ACTIVATED - I THOUGHT THAT IT SUPORTED
DISK AT ONCE RECORDING - IT WORKS OK WITH ANY OTHER TYPE OF CD BUT NOT VCD - IM TRYING TO BURN IT ON A NORMAL 80 CD
ANY IDEAS
CHEERS