Dear all,
I can run GRASS tools using the GRASS 8 (deprecated plugin) using data
stored in a GRASS mapset (e.g. v.buffer). So GRASS seems to be correctly
installed and linked to QGIS.
However, I get an error message when using the same GRASS data or
shaepfile data using the same GRASS tool from the processing toolbar,
available after ticking the GRASS GIS Processing Provider in Plugins -
Manage and Install Plugins. For more details on the log information
trying to run v.buffer on a shapefile see the text below.
I am using QGIS 3.40.15 with GRASS 8.4 installed using the OSGeo4W
installer.
Any help is highly welcome
Jochem
QGIS version: 3.40.15-Bratislava
QGIS code revision: f68f1bf573
Qt version: 5.15.13
Python version: 3.12.12
GDAL version: 3.12.1
GEOS version: 3.14.1-CAPI-1.20.5
PROJ version: Rel. 9.7.1, December 1st, 2025
PDAL version: 2.9.3 (git-version: 31d0d2)
GRASS version: 8.4.2
Algorithm started at: 2026-02-17T11:29:43
Algorithm 'v.buffer' starting…
Input parameters:
{ '-c' : False, '-s' : False, '-t' : 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' : '', 'angle' :
1, 'cats' : '', 'column' : '', 'distance' : 100, 'input' :
'D:/A_Uni_DUE/GISQGISTest/Z_TestDataJK/Probestellen_GIS_aktuell_UTM32.shp',
'layer' : '-1', 'minordistance' : 100, 'output' :
'D:/A_Uni_DUE/GISQGISTest/Z_TestDataJK/ZBufferTestGRASSProcessingProvider.shp',
'scale' : 1, 'tolerance' : 0.01, 'type' : [0], 'where' : '' }
Attempting to use v.external for direct layer read
g.proj -c wkt="C:/Users/Jochem
Kail/AppData/Local/Temp/processing_AztPDF/57ecaacfeef04441827b0e03e1a7b55b/crs.prj"
v.external
input="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\Probestellen_GIS_aktuell_UTM32.shp"
output="vector_69944317348ff3" --overwrite -o
g.region n=5737750.405692774 s=5716318.80064247 e=407087.804598595
w=351579.33806329395
v.buffer input=vector_69944317348ff3 type="point" distance=100
minordistance=100 angle=1 layer="-1" scale=1 tolerance=0.01
output=output203a53f6aacb430c88385ee70ad52a1e --overwrite
v.out.ogr type="auto" input="output203a53f6aacb430c88385ee70ad52a1e"
output="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\ZBufferTestGRASSProcessingProvider.shp"
format="ESRI_Shapefile" --overwrite
WARNUNG: Sperren gleichzeitiger Zugriffe auf ein Mapset ist unter
Windows nicht möglich.
C:\Users\Jochem Kail\Documents>chcp 1252 1>NUL
C:\Users\Jochem Kail\Documents>g.proj -c wkt="C:/Users/Jochem
Kail/AppData/Local/Temp/processing_AztPDF/57ecaacfeef04441827b0e03e1a7b55b/crs.prj"
Die Standard Region wurde auf die neue Projektion aktualisiert. Wenn Sie
aber mehrere Mapsets haben, sollten Sie `g.region -d` in jedem
ausführen, um die Einstellungen von der Standardregion zu übernehmen.
Projektionsinformationen aktualisiert
C:\Users\Jochem Kail\Documents>v.external
input="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\Probestellen_GIS_aktuell_UTM32.shp"
output="vector_69944317348ff3" --overwrite -o
C:\Users\Jochem Kail\Documents>g.region n=5737750.405692774
s=5716318.80064247 e=407087.804598595 w=351579.33806329395
C:\Users\Jochem Kail\Documents>v.buffer input=vector_69944317348ff3
type="point" distance=100 minordistance=100 angle=1 layer="-1" scale=1
tolerance=0.01 output=output203a53f6aacb430c88385ee70ad52a1e --overwrite
FEHLER: Vektorkarte <vector_69944317348ff3> nicht gefunden.
C:\Users\Jochem Kail\Documents>v.out.ogr type="auto"
input="output203a53f6aacb430c88385ee70ad52a1e"
output="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\ZBufferTestGRASSProcessingProvider.shp"
format="ESRI_Shapefile" --overwrite
C:\Users\Jochem Kail\Documents>exit
Execution completed in 7.57 seconds
Results:
output:
D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\ZBufferTestGRASSProcessingProvider.shp
Loading resulting layers
The following layers were not correctly generated.
•
D:/A_Uni_DUE/GISQGISTest/Z_TestDataJK/ZBufferTestGRASSProcessingProvider.shp
You can check the 'Log Messages Panel' in QGIS main window to find more
information about the execution of the algorithm.
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