I wanted to merge files from one study, and luckily they have their data available. Be that as it may, it is in Serial Matrix format. I tried to do normal convertf that I used to do on map ped n stuff. However, I stumbled across this weird error.

familynames: NO
strandcheck: NO
allowdups: YES
hashcheck: NO
## convertf version: 8600
fatalx:
bad chrom: altai1_1m.GType
Aborted (core dumped)