[GRASSLIST:6893] v.proj problem

[Francesco Mirabella]

Hi to all,
I have reprojected 3d vector points from wgs84 lat long location to
utm33:

-in the UTM 33 location:
v.proj input=data_wgs84  output=data_utm33 location=WGS_84_latlong mapset=PERMANENT

I got the following error:
##################################
Input Projection Parameters: +proj=latlong +a=6378137 +rf=298.257223563
+no_defs +towgs84=0.000,0.000,0.000
Input Unit Factor: 1

Output Projection Parameters: +proj=utm +zone=33 +a=6378388 +rf=297
+no_defs +towgs84=-87.000000,-98.000000,-121.000000
Output Unit Factor: 1

Creating vector file...
pj_transform() failed
cause: geocentric transformation missing z or ellps
Error in pj_do_transform
GRASS 6.0.0 (umbmar):~ >
##################################

can someone help?
Francesco

p.s.
I did v.proj transformations some other times from the same location
into the utm33 location, but it is the first time that this error
occurred.