human
Solve the following python programming problem given the following code:
def main(reactor, cred, masterIP, masterPort, consolePort, extIP, extPort, commPort, pkgPath, customConverters) : 
    log.startLogging (sys.stdout) 
    def _err(reason) : 
        print (reason) 
        reactor.stop () 
factory = PBClientFactory () 
    reactor.connectTCP (masterIP, masterPort, factory) 
    rosPath = [] 
    for path in (get_ros_paths () + [p for (p, _) in pkgPath]) : 
        if (path not in rosPath) : 
            rosPath.append (path) 
loader = Loader (rosPath) 
    converter = Converter (loader) 
    for customConverter in customConverters : 
        (module, className) = customConverter.rsplit ('.', 1) 
        mod = __import__ (module, fromlist = [className]) 
        converter.addCustomConverter (getattr (mod, className)) 
client = RobotClient (reactor, masterIP, consolePort, commPort, extIP, extPort, loader, converter) 
    d = factory.login (cred, client) 
    d.addCallback ((lambda ref : setattr (client, '_avatar', ref))) 
    d.addErrback (_err) 
    robot = CloudEngineWebSocketFactory (client, 'ws://localhost:{0}'.format (className)) 
    listenWS (robot) 
    reactor.addSystemEventTrigger ('before', 'shutdown', client.terminate) 
    reactor.run () 

    
    

    Fix the buggy line: robot = CloudEngineWebSocketFactory (client, 'ws://localhost:{0}'.format (className))
assistant
#Here is Python code to fix the buggy line: robot = CloudEngineWebSocketFactory (client, 'ws://localhost:{0}'.

robot = CloudEngineWebSocketFactory (client, 'ws://localhost:{0}'.format (extPort))