hi...i am a bit confused with dvda2...i have tried to burn a movie (mpeg2 for dvda pal and i rendered the sound separate with ac3 format then i have imported them in dvda 2 to burn them on dvd,i have choosed the pal and the ac3 in the preferences i made a preview and it worked fine,i have burned them on dvd but when i have tryed to play back them in power dvd it gave me an error ''the paramerer is incorrect'' so i need some help pls

what have i did wrong and how can solve this?

thanks gabriel