[GRASS-user] Problem running GRASS on Vista

[Anke Konrad]

Hi all,

I have been running into problems with R on one of my Vista machines. In 
both cases I am running GRASS 6.4.0 (installed by the online OSGeo4W 
installer) on Vista machines. However, on one of those two computers, I 
get to the screen where  choose the location etc., however, once I 
decide to start GRASS, I get the following error:

"Error setting region (Problem with g.region?):"

When I then click OK, I get the following message:

can't read "prj(units)":no such variable
   while executing
"set mapunits $prj(units)"
   (procedure "MapCanvas::get_mapunits"line25)
   invoked from within
"MapCanvas::get_mapunits"
   (procedure "MapCanvas::currentzoom"line10)
   invoked from within
"MapCanvas::currentzoom$mon"
   (procedure "MapCanvas::coordconv"line23)
   invoked from within
"MapCanvas::coordconv$mon"
   (procedure "MapCanvas::create"line68)
   invoked from within
"MapCanvas::create"
   (procedure "GM::startmon"line11)
   invoked from within
"GM::startmon"
   (procedure "GM::create"line79)
   invoked from within
"GM::create"
   (procedure "main"line30)
   invoked from within
"main::$argc$argv"
   (file "C:OSGeo4W/apps/grass/grass-6.4.0svn\etc\gm\gm.tcl"line566)

Can anyone tell me why this would be happening (only on one computer but 
not another), or otherwise suggest to me what could maybe be done to get 
GRASS working?

Thank you for your help!

~ Anke