[GRASS-windows] Error while adding scale and legend in GRASS6.4

[António Rocha]

I've sent a similar message to Grass-user but, I think this might be a 
GRASS_windows error.
I'm using native WinGRASS 6.4
My region is defined as:
projection: 3 (Latitude-Longitude)
zone:       0
datum:      wgs84
ellipsoid:  wgs84
north:      83:00:10N
south:      34N
west:       11:00:10W
east:       41:00:00.000002E
nsres:      0:00:10
ewres:      0:00:10
rows:       17641
cols:       18721
cells:      330257161

As Hamish has explained me, I'm not able to add a scale bar due to the 
fact that this is a Lat/Lon Projection.
Never the less I can add only north Arrow if I choose "add only north 
arrow" in d.barscale>Optional.
But If I try to add Scale, I get a Error Window with:
*"Failure executing 'd.barscale.exe at=0,5 --q'

Details: Error: d.barscale.exe does not work with a latitude-longitude*

And the following is printed in command output:
*Traceback (most recent call last):
  File "c:\OSGeo4W\apps\grass\grass-6.4.0svn\etc\wxpython\gu
i_modules\gdialogs.py", line 416, in OnOK

# close dialog
  File "C:\GRASS6\etc\wxpython\gui_modules\mapdisp.py", line
785, in UpdateMap

for img in self.GetOverlay():
  File "C:\GRASS6\etc\wxpython\gui_modules\mapdisp.py", line
647, in GetOverlay

if os.path.isfile(overlay.mapfile) and
os.path.getsize(overlay.mapfile):
  File "C:\GRASS6\Python25\lib\ntpath.py", line 283, in
isfile

st = os.stat(path)
TypeError
:
coercing to Unicode: need string or buffer, NoneType found

*Then everytime I press  display map or Zoom In/Zoom Out I get the same 
Window-Error and text in the command window.

My question is: is this an expected error/situation?
Thanks

Antonio

A
Hamish wrote:
> António wrote:
>   
>> I have a location with a region with the following
>> characteristics:
>>
>> projection: 3 (Latitude-Longitude)
>>     
> ...
>   
>> When I try to add north arrow/Scale to the map I get a
>> ERROR-Window with the following:
>>     
> ...
>   
>> Error: b.barscale does not work with a latitude-longitude
>> location
>>     
>
>
> A scale-bar simply does not & can not work with lat/lon.
> Distance scale is not the same on the x and y axes.
> Use d.grid instead.
>
> See the help page.
>
>
> (there was an idea to change the units to degrees/min/sec for
> lat/lon scalebars a while back but it hasn't been implemented
> yet)
>
>
>   
>> And the following error is printed in the command output:
>> *Traceback (most recent call last):
>>  File
>> "c:\OSGeo4W\apps\grass\grass-6.4.0svn\etc\wxpython\gu
>> i_modules\gdialogs.py", line 416, in OnOK
>>
>> # close dialog
>>  File "C:\GRASS6\etc\wxpython\gui_modules\mapdisp.py",
>> line
>> 785, in UpdateMap
>>
>> for img in self.GetOverlay():
>>  File "C:\GRASS6\etc\wxpython\gui_modules\mapdisp.py",
>> line
>> 647, in GetOverlay
>>
>> if os.path.isfile(overlay.mapfile) and
>> os.path.getsize(overlay.mapfile):
>>  File "C:\GRASS6\Python25\lib\ntpath.py", line 283, in
>> isfile
>>
>> st = os.stat(path)
>> TypeError
>> :
>> coercing to Unicode: need string or buffer, NoneType found
>> *
>>
>> Is this a bug or is this something that would be expected?
>> If it's a bug I will add to the trac
>>     
>
> all that extra noise isn't nice, it should give the error and
> quietly go away.
>
>
> Hamish
>
>
>
>       
>
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