IndexError: string index out of range about bamsnap HOT 1 OPEN

I have this same problem. I investigated the code and it's a problem with the function that loads ref data from the fasta file. Something is wrong with the position indexing causing the number of bases to be shorter than the range that's trying to read those bases. The data loader seems to add a configurable margin and well as an additional 500 bases on each side of the range. I'm not really sure why, maybe for visualization reasons? Anyway, i tried debugging it and mostly just got confused because it loads 599 bases when I use a range of 1-1700, but it only loads 1 base with a range of 1-581 and 19 bases with a range of 581-1700. Which means that somehow not only is the program running into indexing errors by making the range larger than the number of bases, but when I try to narrow the range it just loads barely any data at all, which is incredibly confusing. Normally I would expect the number of bases in range 1:1700 to equal the number of bases in any split of the range, so I simply don't understand how indexing is supposed to work in for this program. I think it's some kind of user error on the indexing, but the documentation doesn't really explain how to make this work. I get the sense the program was designed primarily for downloading reference data from a database so that the overlap margin data exists and this is causing weird out of range error behaviour for a full "chromosome" interval where you want to visualize the entire chromosome interval because your reference fasta database is made up of single genes (which is my use case).

from bamsnap.