human
Solve the following python programming problem given the following code:
def add_next_tick_callback(self, callback, cleanup = None) : 
    ' Adds a callback to be run on the next tick.
        Returns a callable that removes the callback if called.' 
    if (callback in self._next_tick_callbacks) : 
        raise ValueError ('Next-tick callback added twice') 
wrapper = self._wrap_next_tick (self, cleanup) 
    self._loop.add_callback (wrapper) 
    def remover() : 
        wrapper.handle ['removed'] = True 
        self._remover (callback, self._next_tick_callbacks, cleanup) 
self._next_tick_callbacks [callback] = remover 
    return remover 

    
    

    Fix the buggy line: wrapper = self._wrap_next_tick (self, cleanup)
assistant
#Here is Python code to fix the buggy line: wrapper = self.

wrapper = self._wrap_next_tick (callback, cleanup)