r.viewshed.cva error: No points found, nothing to be exported

I need to do an intensive viewshed and I am going to use our university SCC (Linux).

I am running a test viewshed with only 13 observers (just to build the code – eventually the script will be used on an OP shapefile with 700k points).

I’ve imported them into GRASS, and they are overlaying properly on the DEM. The input is simple (1.65m offset of the observer, no targets, 0.13 refraction. I’ve used these same parameters in ArcMap and it works fine.

Here is the code:

r.viewshed.cva -c input=pelop1arcm34b@PERMANENT vector=PI_14@PERMANENT output=test observer_elevation=1.65 memory=1000 refraction_coeff=0.13

For the output, I get this error:

WARNING: No points found, nothing to be exported
Note that the routine is constrained to points in the current geographic region.
Calculating "Cumulative Viewshed" map
ERROR: Raster map not found
Traceback (most recent call last):
  File "C:UsersnsusmAppDataRoamingGRASS7addons/scripts
/r.viewshed.cva.py", line 181, in <module>
    main()
  File "C:UsersnsusmAppDataRoamingGRASS7addons/scripts
/r.viewshed.cva.py", line 169, in main
    input=(",").join(vshed_list), output=out,
method="count")
  File "C:PROGRA~1QGIS2~1.18appsgrassgrass-7.4.0etcpy
thongrassscriptcore.py", line 421, in run_command
    return handle_errors(returncode, returncode, args,
kwargs)
  File "C:PROGRA~1QGIS2~1.18appsgrassgrass-7.4.0etcpy
thongrassscriptcore.py", line 332, in handle_errors
    returncode=returncode)
grass.exceptions.CalledModuleError: Module run None
['r.series', '--q', 'input=', 'method=count', 'output=test']
ended with error
Process ended with non-zero return code 1. See errors in the
(error) output.