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Revit API
2

Nice code you have there, after a little debbuging I’ve received this error:

global name 'TaskDialog' is not defined

Looks like you need to from Autodesk.Revit.UI import TaskDialog within class function:
Bug is in this section:

    def Execute(self, data):
        doc = data.GetDocument()
        for id in data.GetModifiedElementIds():
            element = doc.GetElement(id)
            source_param = element.LookupParameter(self.source_param_name)
            target_param = element.LookupParameter(self.target_param_name)

            if source_param and target_param:
                from Autodesk.Revit.UI import TaskDialog
                # Transfer the value from the source parameter to the target parameter
                target_param.Set(source_param.AsString())
                # Here's the issue:
                TaskDialog.Show("Parameter Linker", "Updated {} based on {}".format(self.target_param_name, self.source_param_name))

Or just delete/comment this line as after few pop-ups users will hate it.

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