problem burning divx files with popcorn?

i dont know if im doing something wrong or what but what i did is i had an avi file than i converted it to a divx file with divx converter. after that i opened popcorn 3.0.2 and selected dvd video.
menu style-corporate
auto play on insert-check
play all items continuously-check
encoding-automatic
video quality-best
than after that i drag the divx file to popcorn and burn it on to a verbatim dvd+r double layer 8.5 gb dvd. after i burned the dvd no errors came up and after it was finished burning i put the dvd in the computer and it automaticly ejects the disc.

does anyone know what im doing wrong? do i have it on the wrong setting in popcorn or something?