I get this error in SpruceUp dvd

'PAL/NTSC video format error with project settings'

the video file is 25fps and 720x576 which is pal and i have pal selected in project settings.

I still get the error if i select ntsc.

the error occurs when i select write in export.

The video file imports fine into Ulead DVD so it must be ok.

Any ideas.....?