DVD2SVCD problem

avisource: could not decompress frame 0
c:\programfiles\dvd2svcd\TEMP\Preview.avs, line 2

I am getting this message while i am trying to preview video on dvd2svcd and if i try to convert it starts but it stops after couples of minutes. I tried to play the video on media plays it plays fine no lags and stuff. By the way i am using the chickenman guide ot convert this avi file. Other movies work fine only two avi files are doing this
any suggestions why it is doing this thanks

The other thing i did was that i joined two files using virtualdub i don’t know whether that the factor