human
Solve the following python programming problem given the following code:
def __init__(self) : 
    cls = self.__class__ 
    self._data = { 
        
} 
    self._callbacks = { 
        
} 
    self._events = { 
        
} 
    self._request_uri = None 
    self._json_uri = None 
    self._request_args = None 
    def invalid_request(obj_response, func_name) : 
        'Handler to be called when an unknown function is called.' 
        msg = 'The action you performed is unavailable! (Sijax error)' 
        obj_response.alert (msg) 
def invalid_call(obj_response, callback) : 
        'Handler to be called when a function is called the wrong way.' 
        msg = 'You tried to perform an action in a wrong way! (Sijax error)' 
        obj_response.alert (msg) 
self.register_event (cls.EVENT_BEFORE_PROCESSING, (lambda r : r)) 
    self.register_event (cls.EVENT_AFTER_PROCESSING, (lambda r : r)) 
    self.register_event (cls.EVENT_INVALID_REQUEST, invalid_call) 
    self.register_event (cls.EVENT_INVALID_CALL, invalid_call) 

    
    

    Fix the buggy line: self.register_event (cls.EVENT_INVALID_REQUEST, invalid_call)
assistant
#Here is Python code to fix the buggy line: self.

self.register_event (cls.EVENT_INVALID_REQUEST, def invalid_request()