human
Solve the following python programming problem given the following code:
def __init__(self, parent) : 
    ScriptedLoadableModuleWidget.__init__ (self, __onNodeAddedObserver__) 
    from functools import partial 
    def __onNodeAddedObserver__(self, caller, eventId, callData) : 
        'Node added to the Slicer scene' 
        if ((callData.GetClassName () == 'vtkMRMLScalarVolumeNode') and (slicer.util.mainWindow ().moduleSelector ().selectedModule == self.moduleName)) : 
            self.volumeSelector.setCurrentNode (callData) 
self.__onNodeAddedObserver__ = partial (__onNodeAddedObserver__, self) 
    self.__onNodeAddedObserver__.CallDataType = vtk.VTK_OBJECT 

    
    

    Fix the buggy line: ScriptedLoadableModuleWidget.__init__ (self, __onNodeAddedObserver__)
assistant
#Here is Python code to fix the buggy line: ScriptedLoadableModuleWidget.

ScriptedLoadableModuleWidget.__init__ (self, parent)