Remember that long list of warnings and cautions I gave you about Compile[] and one of those was that all integers needed to be less than 32 bits. It looks like you either have a small syntax problem or you have stepped over that limit.

By trial and error see if you can create a MUCH shorter list Composites.csv that still demonstrates this error, post that here and I'll see if I can figure out what you have done. I don't want to have to dig through thousands of numbers to discover where your problem is. But as I also said, when you ran into troubles with a Compile I might easily not be the person to figure it out for you.

And yes, that annoying space and other formatting problems show up in text pasted onto the forum. I mentioned that before. That isn't the problem, just as long as you remember to watch for and fix that. I think that inserting a few spaces after commas or operators sometimes makes the problem hide.