human
Solve the following python programming problem given the following code:
@ classmethod 
def setUpClass(cls) : 
    cls.filename = '/tmp/greequeue.touch' 
    from multiprocessing import Process 
    def _subfunction() : 
        settings.GREENQUEUE_BACKEND = 'greenqueue.backends.zeromq.ZMQService' 
        settings.GREENQUEUE_WORKER_MANAGER = 'greenqueue.worker.process.ProcessManager' 
        management.call_command ('run_greenqueue', verbosity = 3) 
cls.p = Process (target = cls) 
    cls.p.start () 
    settings.GREENQUEUE_BACKEND = 'greenqueue.backends.zeromq.ZMQService' 
    settings.GREENQUEUE_WORKER_MANAGER = 'greenqueue.worker.process.ProcessManager' 

    
    

    Fix the buggy line: cls.p = Process (target = cls)
assistant
#Here is Python program to fix the buggy line: cls.

cls.p = Process (target = def _subfunction()