NZ psx2 DVD playback problems

Hi...yeah...i bought end of days DVD today...what happened is that whenever it reached chapter 20 of the movie it says it can\'t read it...all the other chapters work fine and beautiful but whenever i access chapter 20 it can\'t read it... but when i play it on the pc\'s dvd it works perfectly fine..

is it my ps2\'s problem or is it the DVD roms...