Yes you need to chose an output type yourself, but nomatter what I choose I get the same error message.
I am running on windows and no matter what Grass procedure I run I get this warning: WARNING: Concurrent mapset locking is not supported on Windows. Do not know what it means or whether it is relevant in this case? Error message from v.centrality.net: QGIS version: 3.10.0-A Coruña QGIS code revision: 6c816b4204 Qt version: 5.11.2 GDAL version: 2.4.1 GEOS version: 3.8.0-CAPI-1.13.1 PROJ version: Rel. 5.2.0, September 15th, 2018 Processing algorithm… Algorithm 'v.net.centrality' starting… Input parameters: { '-a' : True, '-g' : False, 'GRASS_MIN_AREA_PARAMETER' : 0.0001, 'GRASS_OUTPUT_TYPE_PARAMETER' : 0, 'GRASS_REGION_PARAMETER' : None, 'GRASS_SNAP_TOLERANCE_PARAMETER' : -1, 'GRASS_VECTOR_DSCO' : '', 'GRASS_VECTOR_EXPORT_NOCAT' : False, 'GRASS_VECTOR_LCO' : '', 'arc_backward_column' : None, 'arc_column' : None, 'betweenness' : '', 'cats' : '', 'closeness' : 'closeness', 'degree' : 'degree', 'eigenvector' : '', 'error' : 0.1, 'input' : 'C:\\@Temp\\net.shp|layername=net', 'iterations' : 1000, 'node_column' : None, 'output' : 'C:/@Temp/central.shp', 'points' : 'C:\\@Temp\\Poi.shp|layername=Poi', 'threshold' : 50, 'where' : '' } Attempting to use v.external for direct layer read Attempting to use v.external for direct layer read g.proj -c proj4="+proj=longlat +datum=WGS84 +no_defs" v.external input="C:\@Temp\net.shp" layer="net" output="vector_5dba985f06fbb16" --overwrite -o v.external input="C:\@Temp\Poi.shp" layer="Poi" output="vector_5dba985f09e9b17" --overwrite -o g.region n=9.327649580604518 s=9.271627488192191 e=38.7617967871377 w=38.74138436843244 v.net -s input=vector_5dba985f06fbb16 points=vector_5dba985f09e9b17 output=net5dba985f0b22318 operation=connect threshold=50.0 v.db.connect -o map=net5dba985f0b22318 table=vector_5dba985f09e9b17 layer=2 v.net.centrality input=net5dba985f0b22318 degree="degree" closeness="closeness" iterations=1000 error=0.1 -a output=output94c0c01b65de4586878116ac9fa984ae --overwrite v.out.ogr type="point" input="output94c0c01b65de4586878116ac9fa984ae" output="C:/@Temp/central.shp" format="ESRI_Shapefile" layer=1 --overwrite Cleaning up temporary files... Starting GRASS GIS... WARNING: Concurrent mapset locking is not supported on Windows Executing <C:\Users\map\AppData\Local\Temp\processing_71c0848ce9e34603963223277d5e5a40\grassdata\grass_batch_job.cmd> ... C:\Users\map\Documents>chcp 1252 1>NUL C:\Users\map\Documents>g.proj -c proj4="+proj=longlat +datum=WGS84 +no_defs" Default region was updated to the new projection, but if you have multiple mapsets `g.region -d` should be run in each to update the region from the default Projection information updated C:\Users\map\Documents>v.external input="C:\@Temp\net.shp" layer="net" output="vector_5dba985f06fbb16" --overwrite -o Over-riding projection check Building topology for vector map <vector_5dba985f06fbb16@PERMANENT>... Using external data format 'ESRI Shapefile' (feature type 'linestring') Registering primitives... One primitive registered 43 vertices registered v.external complete. Link to vector map <vector_5dba985f06fbb16> created. C:\Users\map\Documents>v.external input="C:\@Temp\Poi.shp" layer="Poi" output="vector_5dba985f09e9b17" --overwrite -o Over-riding projection check Building topology for vector map <vector_5dba985f09e9b17@PERMANENT>... Using external data format 'ESRI Shapefile' (feature type 'point') Registering primitives... 334 primitives registered 334 vertices registered v.external complete. Link to vector map <vector_5dba985f09e9b17> created. C:\Users\map\Documents>g.region n=9.327649580604518 s=9.271627488192191 e=38.7617967871377 w=38.74138436843244 C:\Users\map\Documents>v.net -s input=vector_5dba985f06fbb16 points=vector_5dba985f09e9b17 output=net5dba985f0b22318 operation=connect threshold=50.0 Copying features... 100 Building topology for vector map <net5dba985f0b22318@PERMANENT>... Registering primitives... Copying attributes... WARNING: Unable to create index WARNING: Unable to copy table <net> for layer 1 from <vector_5dba985f06fbb16@PERMANENT> to <net5dba985f0b22318> WARNING: Failed to copy attribute table to output map Building topology for vector map <net5dba985f0b22318@PERMANENT>... Registering primitives... v.net complete. 9 lines (network arcs) written to output. C:\Users\map\Documents>v.db.connect -o map=net5dba985f0b22318 table=vector_5dba985f09e9b17 layer=2 WARNING: Table <vector_5dba985f09e9b17> does not exist in database <$GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db> The table <vector_5dba985f09e9b17> is now part of vector map <net5dba985f0b22318> and may be deleted or overwritten by GRASS modules WARNING: Cannot create index Select privileges were granted on the table C:\Users\map\Documents>v.net.centrality input=net5dba985f0b22318 degree="degree" closeness="closeness" iterations=1000 error=0.1 -a output=output94c0c01b65de4586878116ac9fa984ae --overwrite Building graph... Registering arcs... 1..3..5..7..9..11..13..15..17..19..21..23..25..27..29..31..33..35..37..39..41..43..45..47..49..51..53..55..57..59..61..63..65..67..69..71..73..75..77..79..81..83..85..87..89..91..93..95..97..99..100 Flattening the graph... Graph was built Computing degree centrality measure Computing betweenness and/or closeness centrality measure 0..9..18..27..36..45..54..63..72..81..90..Writing data into the table... 1..3..5..7..9..11..13..15..17..19..21..23..25..27..29..31..33..35..37..39..41..43..45..47..49..51..53..55..57..59..61..63..65..67..69..71..73..75..77..79..81..83..85..87..89..91..93..95..97..99..100 Building topology for vector map <output94c0c01b65de4586878116ac9fa984ae@PERMANENT>... Registering primitives... C:\Users\map\Documents>v.out.ogr type="point" input="output94c0c01b65de4586878116ac9fa984ae" output="C:/@Temp/central.shp" format="ESRI_Shapefile" layer=1 --overwrite Exporting 335 features... 5..11..17..23..29..35..41..47..53..59..65..71..77..83..89..95..100 v.out.ogr complete. 335 features (Point type) written to <output94c0c01b65de4586878116ac9fa984ae> (ESRI_Shapefile format). C:\Users\map\Documents>exit Execution of <C:\Users\map\AppData\Local\Temp\processing_71c0848ce9e34603963223277d5e5a40\grassdata\grass_batch_job.cmd> finished. Cleaning up default sqlite database ... Cleaning up temporary files... Execution completed in 12.81 seconds Results: {'output': <QgsProcessingOutputLayerDefinition {'sink':C:/@Temp/central.shp, 'createOptions': {'fileEncoding': 'UTF-8'}}>} Loading resulting layers Algorithm 'v.net.centrality' finished ----- Regards Morten Currently using Qgis 2.18.23 (OSGeo4) and Qgis 3.10.0 in parallel Windows 7, 64bit -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-f4099106.html _______________________________________________ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer