Jerry

> What is the output of g.region -p? g.region -p projection: 3 zone: 0 datum: wgs84 ellipsoid: wgs84 north: 30:31:17.732976N south: 29:23:41.689821N west: 117:11:52.591641E east: 118:53:57.596247E nsres: 0:00:00.998534 ewres: 0:00:00.998534...

> What is the output of g.region -p? Thanks! I search ''g_spawn: unable to execute command.'' in Google, but nobody encounters this issues. Sadly:( I install GRASS 7.9 (ver 125)...

> `r.watershed --o --q -abs elevation=DEM@PERMANENT hbasin=slu_r thresh=1169` > > does this command work for you outside of a python script with the computational region you've posted above? I run...

> `r.watershed --o --q -abs elevation=DEM@PERMANENT hbasin=slu_r thresh=1169` > > does this command work for you outside of a python script with the computational region you've posted above? I think...

> > How do I output more detail error log information? > > try following steps > > * set your computational region by g.region > * set debug level...

> Could @wjcper2008 give DEM@PERMANENT metadata info (execute command `r.info -g DEM@PERMANENT`) please? > What kind of OSGeo4W installer do you use 32 bit (osgeo4w-setup-x86.exe) or 64 bit (osgeo4w-setup-x86_64.exe) please?...

> I was successfull with deriving basin (NC location) with GRASS GIS 7.8.5 (OSGeo4W installer, express GRASS GIS install only), and GRASS GIS 7.9 (Standalone installer) without this error. >...

> ``` > g.region raster=DEM@PERMANENT > g.gisenv set='DEBUG=3' > r.watershed --o -abs elevation=DEM@PERMANENT hbasin=slu_r thresh=1169 > ``` > > please run it in DEBUG=3 mode again, but without the quiet...

> echo %GISBASE% Thanks @hellik @nilason `-m` is still not work for `r.watershed` as `Beautify flat areas is not yet supported for disk swap mode` ``` (Fri May 21 22:42:41...

> are any other r*.modules working for you? > > e.g. > > * r.slope.aspect > * r.stream.extract > * r.topidx > * r.param.scale > * r.flow Thanks @hellik I...