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<p>Dear all,</p>
<p>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.</p>
<p>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.</p>
<p>I am using QGIS 3.40.15 with GRASS 8.4 installed using the
OSGeo4W installer.</p>
<p>Any help is highly welcome</p>
<p>Jochem</p>
<p><font size="1"><span style=" color:#777777;">QGIS version:
3.40.15-Bratislava</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">QGIS code revision:
f68f1bf573</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">Qt version: 5.15.13</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">Python version: 3.12.12</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">GDAL version: 3.12.1</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">GEOS version:
3.14.1-CAPI-1.20.5</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">PROJ version: Rel. 9.7.1,
December 1st, 2025</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">PDAL version: 2.9.3
(git-version: 31d0d2)</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#777777;">GRASS version: 8.4.2</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Algorithm started at: 2026-02-17T11:29:43</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-weight:600;">Algorithm 'v.buffer'
starting…</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Input parameters:</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">{ '-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' : '' }</span></font></p>
<p
style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><br>
</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Attempting to use v.external for direct layer read</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">g.proj -c
wkt="C:/Users/Jochem
Kail/AppData/Local/Temp/processing_AztPDF/57ecaacfeef04441827b0e03e1a7b55b/crs.prj"</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">v.external
input="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\Probestellen_GIS_aktuell_UTM32.shp"
output="vector_69944317348ff3" --overwrite -o</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">g.region
n=5737750.405692774 s=5716318.80064247 e=407087.804598595
w=351579.33806329395</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">v.buffer
input=vector_69944317348ff3 type="point" distance=100
minordistance=100 angle=1 layer="-1" scale=1 tolerance=0.01
output=output203a53f6aacb430c88385ee70ad52a1e --overwrite</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';">v.out.ogr
type="auto" input="output203a53f6aacb430c88385ee70ad52a1e"
output="D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\ZBufferTestGRASSProcessingProvider.shp"
format="ESRI_Shapefile" --overwrite</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">WARNUNG:
Sperren gleichzeitiger Zugriffe auf ein Mapset ist unter
Windows nicht möglich.</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">C:\Users\Jochem
Kail\Documents>chcp 1252 1>NUL</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">C:\Users\Jochem
Kail\Documents>g.proj -c wkt="C:/Users/Jochem
Kail/AppData/Local/Temp/processing_AztPDF/57ecaacfeef04441827b0e03e1a7b55b/crs.prj"</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">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.</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">Projektionsinformationen
aktualisiert</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">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</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">C:\Users\Jochem
Kail\Documents>g.region n=5737750.405692774
s=5716318.80064247 e=407087.804598595 w=351579.33806329395</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">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</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">FEHLER:
Vektorkarte <vector_69944317348ff3> nicht gefunden.</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">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</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span
style=" font-family:'Courier New'; color:#777777;">C:\Users\Jochem
Kail\Documents>exit</span></font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Execution completed in 7.57 seconds</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Results:</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" font-family:'Courier New';"> output:
D:\A_Uni_DUE\GISQGISTest\Z_TestDataJK\ZBufferTestGRASSProcessingProvider.shp</span></font></p>
<p
style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><br>
</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1">Loading resulting layers</font></p>
<p
style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><font
size="1"><span style=" color:#ff0000;">The following layers were
not correctly generated.<br>
•
D:/A_Uni_DUE/GISQGISTest/Z_TestDataJK/ZBufferTestGRASSProcessingProvider.shp<br>
You can check the 'Log Messages Panel' in QGIS main window to
find more information about the execution of the algorithm.</span></font></p>
<p><br>
</p>
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