@dave merchant
The only thing that finally worked for me to make a dvd file was to export the audio track separately . It ended up to be such an easy way to get it done. I've literally spent full days trying to figure this out. from early morning to the wee hours. Thank you so much for that idea. Adobe didn't even suggest that.
When I did what adobe suggested : export the file out as a quicktime .mov - It wouldn't work, they told me if that didn't work - to export it out in small segments - which only worked at between 5 - 10 minutes at a time, and it took me forever. And guess what it was over 600gbs for all the files together. Then I put it on a new timeline and tried to export the dvd file, and guess what? It did the same unknown error compiling movie and all that.
So finally I was at my wits end - of trying dozens and dozens of things, and I exported the dvd m2v file audio only and then video only and it was easy.
THANK YOU SO MUCH.
Wow.