human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    match = self._mapper.match (environ ['PATH_INFO']) 
    if (not match) : 
        return self._not_found (environ, start_response) 
controller_name = match ['controller'] 
    action_name = match ['action'] 
    controller_action = (controller_name, action_name) 
    del match ['controller'] 
    del match ['action'] 
    environ ['concurrence.application'] = self 
    request = Request (environ) 
    response = Response (content_type = self.default_content_type, charset = self.default_charset) 
    with self._scoped_request.set (request) : 
        with self._scoped_response.set (response) : 
            if (not (controller_action in self._filter_chain)) : 
                def last(next, * args, **kwargs) : 
                    return self.call_controller (controller_name, action_name, * args, ** kwargs) 
filter_chain = [] 
                for (i, filter) in enumerate ((self._filters.get (controller_action, []) + [last, None])) : 
                    def create_next(_i, _filter) : 
                        def next(* args, **kwargs) : 
                            return _filter (filter_chain [(_i + 1)], * args, ** kwargs) 
return next 
filter_chain.append (create_next (i, match)) 
self._filter_chain [controller_action] = filter_chain 
result = self._filter_chain [controller_action] [0] (** match) 
if (type (result) == str) : 
        response.body = result 
else : 
        if (type (result) == unicode) : 
            response.unicode_body = result 
else : 
            if (result is None) : 
                response.body = '' 
else : 
                if (type (result) == type (response)) : 
                    response = result 
else : 
                    assert False, ('result must be None, str, unicode or response object, found: %s' % type (result)) 
return response (environ, start_response) 

    
    

    Fix the buggy line: filter_chain.append (create_next (i, match))
assistant
#Here is Python program to fix the buggy line: filter_chain.

filter_chain.append (create_next (i, filter))