human
Solve the following python programming problem given the following code:
def attach(self, gui) : 
    self.gui = gui 
    self._create_actions (gui) 
    gui.add_view (on_close.cluster_view, name = 'ClusterView') 
    if self.quality : 
        self.cluster_view.add_column (self.quality, name = self.quality.__name__) 
self._update_cluster_view () 
    if self.similarity : 
        gui.add_view (self.similarity_view, name = 'SimilarityView') 
cv = self.cluster_view 
    cv.set_state (gui.state.get_view_state (cv)) 
    @ gui.connect_ 
    def on_close() : 
        gui.state.update_view_state (cv, cv.state) 
        gui.state.save () 
self.gui.connect_ (self.on_cluster) 
    return self 

    
    

    Fix the buggy line: gui.add_view (on_close.cluster_view, name = 'ClusterView')
assistant
#Here is Python program to fix the buggy line: gui.

gui.add_view (self.cluster_view, name = 'ClusterView')