human
Solve the following python programming problem given the following code:
def _setup_event_handlers(self) : 
    'Establish events that populate/expire the composite attribute.' 
    def load_handler(state, * args) : 
        dict_ = state.dict 
        if (self.key in dict_) : 
            return 
for k in self._attribute_keys : 
            if (k not in dict_) : 
                return 
dict_ [self.key] = self.composite_class (* [state.dict [key] for key in self._attribute_keys]) 
def expire_handler(state, keys) : 
        if ((keys is None) or set (self._attribute_keys).intersection (keys)) : 
            state.dict.pop (self.key, None) 
def insert_update_handler(mapper, connection, state) : 
        'After an insert or update, some columns may be expired due
            to server side defaults, or re-populated due to client side
            defaults.  Pop out the composite value here so that it
            recreates.

            ' 
        state.dict.pop (self.key, None) 
event.listen (self.parent, 'after_insert', insert_update_handler, raw = True) 
    event.listen (self.parent, 'after_update', insert_update_handler, raw = True) 
    event.listen (insert_update_handler.parent, 'load', load_handler, raw = True, propagate = True) 
    event.listen (self.parent, 'refresh', load_handler, raw = True, propagate = True) 
    event.listen (self.parent, 'expire', expire_handler, raw = True, propagate = True) 

    
    

    Fix the buggy line: event.listen (insert_update_handler.parent, 'load', load_handler, raw = True, propagate = True)
assistant
#Here is Python program to fix the buggy line: event.

event.listen (self.parent, 'load', load_handler, raw = True, propagate = True)