I am trying to run processing algorithms in Python code editor inside QGIS. Here is my code:

zones = QgsVectorLayer('C:/Users/pamidiashoka/Downloads/OP_Pen/boundaries.shp', 'zone boundaries', 'ogr')

points = QgsVectorLayer('C:/Users/pamidiashoka/Downloads/OP_Pen/666_KAMARLE_Adharne/666_KAMARLE_Adharne.shp', 'zone boundaries', 'ogr')

extr = processing.runAndLoadResults('qgis:extractbyexpression', {'INPUT': points,
                    'EXPRESSION':f"filename = '2A_2_Village_Internal_Road_1'",
                    'OUTPUT': 'TEMPORARY_OUTPUT'})
cnt = processing.runAndLoadResults('qgis:extractbylocation', {'INPUT':zones,
                    'PREDICATE': 0,
                    'INTERSECT' : extr['OUTPUT'],
                    'OUTPUT': 'TEMPORARY_OUTPUT'})

The first algorithm is giving proper output and adding a new layer to the panel but the second one is throwing an error. Here is the error I am getting

Traceback (most recent call last):
  File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "<string>", line 13, in <module>
  File "C:\PROGRA~1/QGIS32~1.0/apps/qgis/./python/plugins\processing\tools\general.py", line 151, in runAndLoadResults
    return Processing.runAlgorithm(alg, parameters=parameters, onFinish=handleAlgorithmResults, feedback=feedback,
  File "C:\PROGRA~1/QGIS32~1.0/apps/qgis/./python/plugins\processing\core\Processing.py", line 187, in runAlgorithm
    ret, results = execute(alg, parameters, context, feedback, catch_exceptions=False)
  File "C:\PROGRA~1/QGIS32~1.0/apps/qgis/./python/plugins\processing\gui\AlgorithmExecutor.py", line 72, in execute
    results, ok = alg.run(parameters, context, feedback, {}, False)
_core.QgsProcessingException: Could not create memory layer

What is the cause of this error and how can I resolve this issue?

1 Answer 1


you should try this:

cnt = processing.runAndLoadResults('qgis:extractbylocation', {'INPUT':zones,
                    'PREDICATE': 0,
                    'INTERSECT' : extr,
                    'OUTPUT': 'TEMPORARY_OUTPUT'})

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