I’ve run into the same problem, and it’s a subtitle problem. I have 2 solutions, the easy way n the hard way.
1). The hard way:
The error message pointed at a certain timecode, so go check on the subtitle on the corresponding timecode and there should be some block that sticks to next block. Just separate those blocks (even by 1 frame will fix it). The problem is if you have multiple errors like this, the next time u try to build the DVD it’ll show a similar error with a different timecode, so again u’ll have to go and separate the 2 subtitle block.
2). The easy way:
I use SubtitleEdit, and when I check on my .txt file, it was on PAL while my DVD is NTSC. So all I had to do is change the subtitle format to Adobe Encore NTSC and re-import the new .txt.
Note: When u open a subtitle file with SubtitleEdit, it automatically displays what format it is. And any Adobe Encore format without the word “NTSC” on it is PAL