human
Solve the following python programming problem given the following code:
def Get(self, key, callback, must_exist = True) : 
    'Asynchronously retrieves the specified key/value pair. If the
    operation succeeds, then the callback will be invoked with a single
    byte string (str) argument containing the value.
    If must_exist is False and the file is not found, the callback will be
    invoked with None.
    ' 
    def _OnCompletedGet(response) : 
        if response.error : 
            if (must_exist or (response.error.code != 404)) : 
                raise response.error 
else : 
                callback (None) 
else : 
            callback (response.body) 
_gets_per_min.increment () 
    self._async_s3_conn.make_request ('GET', bucket = key._bucket_name, key = key, callback = _OnCompletedGet) 

    
    

    Fix the buggy line: self._async_s3_conn.make_request ('GET', bucket = key._bucket_name, key = key, callback = _OnCompletedGet)
assistant
#Here is Python program to fix the buggy line: self.

self._async_s3_conn.make_request ('GET', bucket = self._bucket_name, key = key, callback = _OnCompletedGet)