human
Solve the following python programming problem given the following code:
@ patch ('pyon.net.endpoint.get_ion_ts', Mock (return_value = sentinel.ts)) 
def test_receive_bad_op(self) : 
    class FakeMsg (object) : 
        def __init__(self) : 
            self.named = ['ein', 'zwei'] 
cvalue = FakeMsg () 
    e = RPCResponseEndpointUnit (routing_obj = self, interceptors = { 
        
}) 
    ch = self._setup_mock_channel (value = e, op = 'no_exist') 
    e.attach_channel (ch) 
    self._do_listen (e) 
    assert_called_once_with_header (self, ch.send, { 
        'status_code' : 400, 
        'error_message' : 'Unknown op name: no_exist', 
        'conv-id' : sentinel.conv_id, 
        'conv-seq' : 2, 
        'protocol' : '', 
        'performative' : 'failure', 
        'language' : 'ion-r2', 
        'encoding' : 'msgpack', 
        'format' : 'list', 
        'receiver' : ',', 
        'ts' : sentinel.ts, 
}) 

    
    

    Fix the buggy line: ch = self._setup_mock_channel (value = e, op = 'no_exist')
assistant
#Here is Python program to fix the buggy line: ch = self.

ch = self._setup_mock_channel (value = cvalue, op = 'no_exist')