Qgis 4 Failure Diagnosis

Sub-skill of qgis: 4. FAILURE DIAGNOSIS.

vamseeachanta Updated

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4. FAILURE DIAGNOSIS

4. FAILURE DIAGNOSIS

Error Cause Fix
Layer is not valid Wrong path, unsupported driver, malformed file Check path; verify with ogrinfo; inspect CRS
QgsApplication not initialized Missing initQgis() call Call qgs.initQgis() before any QGIS operation
QGIS prefix path not set Missing env setup Set QgsApplication.setPrefixPath("/usr", True) or use default
No module named 'qgis' QGIS Python not on PYTHONPATH Run inside QGIS Python console or set PYTHONPATH
CRS is not valid / unknown EPSG code not found Use QgsCoordinateReferenceSystem.fromEpsgId(4326)
Processing OUTPUT is None Algorithm failed silently Check feedback.pushWarning() output; validate inputs
offscreen platform error Qt platform missing Install libqt5gui5; set QT_QPA_PLATFORM=offscreen
Shapefile truncated field names Shapefile 10-char limit Export to GeoPackage instead

vamseeachanta/workspace-hub/tree/main/.agents/skills/_archive/engineering/gis/qgis/4-failure-diagnosis commit 2f652a8621

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