error from v.to.rast

Hi,
who has seen the following error message before, any solution?
The raster file which is written finally is empty.
We are running grass4.1.5 (with floating points).

GRASS 4.1 > v.to.rast input=bod22-1.vct output=yyy
Loading vector information ... 0 mins 00 secs
Sorting areas by size ... 979 areas 0 mins 02 secs
Pass #1 (of 2)
  Processing areas ... 979 areas 0 mins 04 secs
  Processing lines ... 0 lines 0 mins 00 secs
  Processing sites ... 0 sites 0 mins 00 secs
  Writing raster map ...WARNING: Calling G_set_window() in the middle of
      writing map yyy
                        0 mins 14 secs
Pass #2 (of 2)
  Processing areas ... 979 areas 0 mins 03 secs
  Writing raster map ... 0 mins 06 secs
Creating support files for raster map ... 0 mins 00 secs

Raster map <yyy> done.

best regards,

Okke Batelaan

VVVVVVVVVVVVVVVVVVVVVVUUUUUUUUUUUUUUUUUUUUUUUUBBBBBBBBBBBBBBBBBBBBBBBBBBBB
Okke Batelaan
Laboratory of Hydrology email: batelaan@hydr1.vub.ac.be
Free University Brussels tel: x-32-2-6293021
Pleinlaan 2 fax: x-32-2-6293022
1050 BRUSSELS, BELGIUM
HHHHHHHHHHYYYYYYYYYYDDDDDDDDDRRRRRRROOOOOOOOOLLLLLLLLLOOOOOOOOOGGGGGYYYYYY