I'm create a python script tool in QGIS that is working perfect. However when I use the "Selected features only" checkbox to run my script in just one polygon feature it returns the following error:

Could not load source layer for INPUT: invalid value

Here in how I'm initiating the variable in initAlgorithm and processAlgorithm functions:

def initAlgorithm(self, config=None):
                self.tr('Property Polygon'),
def processAlgorithm(self, parameters, context, feedback):
    shp_roi = self.parameterAsSource(parameters, self.INPUT_POL, context)

How could I overcome this issue?

  • Code seems absolutely correct. Does this issue repeat on different data sourses or layers?
    – RainForest
    Commented Mar 9, 2023 at 18:38
  • Could you provide a minimal working example? Commented Mar 11, 2023 at 12:31


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