It's a difficult error to track down. Hopefully it's fixed for the next version and there is an option to bypass the space check, but if you wouldn't mind pming me a little about your setup it might help narrow it down in particular:
Windows Version
Windows Language (base and selected interface language)
JKA Version (steam/gog/disc)
JKA install path
MBIILauncher path
Disk type (sata/scsi/removeable/nas)