human
Solve the following python programming problem given the following code:
def testAnotherRoutine(self) : 
    def anotherRoutine(d) : 
        c = config.Configurator () 
        self.assertTrue ((c ['listen'] == 'host.name.com:4111')) 
self.config ['listen'] = 'host.name.com:4111' 
    d = defer.Deferred () 
    d.addCallback (d) 
    d.callback (None) 

    
    

    Fix the buggy line: d.addCallback (d)
assistant
#Here is Python program to fix the buggy line: d.

d.addCallback (def anotherRoutine()