[mkgmap-dev] What does this error mean?

Hi, I'm currently building my maps and for some tiles I get the following error messages. The the english speaking (Schwerwiegend = Severe) Is this a mkgmap bug, or I the osm data corrupt? How can I solve this problem? SCHWERWIEGEND (Polyline): 72240288.osm.gz: Problem writing line (class uk.me.parabola.imgfmt.app.trergn.Polyline) of type 0x15 containing 28 points and starting at http://www.openstreetmap.org/?mlat=74.99963&mlon=-18.87219&zoom=17 SCHWERWIEGEND (Polyline): 72240288.osm.gz: Subdivision shift is 0 and its centre is at http://www.openstreetmap.org/?mlat=74.62738&mlon=-18.14049&zoom=17 SCHWERWIEGEND (Polyline): 72240288.osm.gz: deltaLong = -34100 Thanks Marco