[GRASS-user] Error in r.basin

[Rosca Bogdan]

Hello! I am trying to run r.basin for some analysis and it start promising
but it end badly:
##########
r.basin.py map=dem_fill at harta prefix=a easting=491896.20 northing=659955.69
threshold=900
Removing raster <MASK>
Raster map <MASK> not found
<MASK> nothing removed
SECTION 1a (of 5): Initiating Memory.
SECTION 1b (of 5): Determining Offmap Flow.
SECTION 2: A * Search.
SECTION 3: Accumulating Surface Flow with SFD.
SECTION 4: Watershed determination.
SECTION 5: Closing Maps.
Writing out only positive flow accumulation values.
Cells with a likely underestimate for flow accumulation can no longer be
identified.
Traceback (most recent call last):
  File "/usr/lib/grass64/scripts/r.basin.py", line 427, in
<module>
    sys.exit(main())
  File "/usr/lib/grass64/scripts/r.basin.py", line 133, in
main
    grass.run_command('r.stream.extract', elevation =
r_elevation, accumulation = r_accumulation, threshold = th,
d8cut = 'infinity', mexp = 0, stream_rast = r_stream_e,
stream_vect = v_stream_e, direction = r_drainage_e, flags
='-o')
  File "/usr/lib/grass64/etc/python/grass/script/core.py",
line 186, in run_command
    ps = start_command(*args, **kwargs)
  File "/usr/lib/grass64/etc/python/grass/script/core.py",
line 167, in start_command
    args = make_command(prog, flags, overwrite, quiet,
verbose, **options)
  File "/usr/lib/grass64/etc/python/grass/script/core.py",
line 124, in make_command
    raise ScriptError("'-' is not a valid flag")
grass.script.core.ScriptError: "'-' is not a valid flag"
(Mon Aug  1 21:19:09 2011) Command finished (2 sec)
########
I must mention that I have Grass64 installed from
https://launchpad.net/~grass/+archive/grass-stable on Ubuntu Maverick and
all dependencies needed ( I have managed to run separately almost every
command but I have in total  22 basins)
Please could someone point me in the right direction ?
Bogdan Rosca
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