Cannot convert VTS_01_1.VOB files using IfoEdit

Hi all,
I have a problem with IfoEdit. This concerns with converting .VOB files.
There are several faulty VTS_01_1.VOB files on many disks, because of the way the disk menus had been created by a video->dvd recorder.
I can convert all of the.VOB files on the disk, but the VTS_01_1.VOB files just weren't responding (huge trash before the navigation pack).

InfoEdit
INTERNAL ERROR:additional data required but no free space in input buffer.
I need help in fixing this problem.
Help will be very much appreciated.
