I cannot open the r.viewshed tool in Grass 7.0.3. I am using the 64-bit version on Windows 7. The error message is given below:

    Traceback (most recent call last):
  File "C:\OSGEO4~1\apps\grass\grass-7.0.3\gui\wxpython\lmgr
\frame.py", line 776, in OnMenuCmd

GUI(parent=self, giface=self._giface).ParseCommand(cmd)
  File "C:\OSGEO4~1\apps\grass\grass-7.0.3\gui\wxpython\gui_
core\forms.py", line 2354, in ParseCommand

raise gcmd.GException(e.value)
Unable to fetch interface description for command
Details: C:\OSGEO4~1\bin\python.exe: can't open file
'r.viewshed': [Errno 2] No such file or directory
  • Do you have problems like this with any other command?
    – markusN
    Feb 7, 2016 at 17:33
  • No, just r.viewshed.
    – HishivS
    Feb 8, 2016 at 10:30
  • ok, it is now discussed on the "GRASS user" list, let's hope to figure out the reason and fix it asap. Thanks for the notification.
    – markusN
    Feb 8, 2016 at 20:53
  • I added the issue to trac.osgeo.org/grass/ticket/2884
    – markusN
    Feb 21, 2016 at 20:13

1 Answer 1


Until the issue is solved, you can install and use function r.viewshed.cva from addons


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