human
Solve the following python programming problem given the following code:
def on_zoom(self, callback, remove = False) : 
    " Assign a callback to zoom events propagated
        by zooming in regions in the Plotly graph.

        Args:
            callback (function): Callback function this is called
                on zoom events with the signature:
                callback(widget, ranges) -> None

                Args:
                    widget (GraphWidget): The current instance
                    of the graph widget that this callback is assigned to.

                    ranges (dict): A description of the
                        region that was zoomed into.

                        ranges example:
                        {
                            'x': [1.8399058038561549, 2.16443359662],
                            'y': [4.640902872777017, 7.855677154582]
                        }

                    remove (bool, optional): If False, attach the callback.
                        If True, remove the callback. Defaults to False.

        Returns:
            None

        Example:
        ```
        from IPython.display import display
        def message_handler(widget, ranges):
            display(widget._graph_url)
            display(ranges)

        g = GraphWidget('https://plot.ly/~chris/3375')
        display(g)

        g.on_zoom(message_handler)
        ```
        " 
    self._handle_registration ('zoom', self, remove) 

    
    

    Fix the buggy line: self._handle_registration ('zoom', self, remove)
assistant
#Here is Python code to fix the buggy line: self.

self._handle_registration ('zoom', callback, remove)