human
Solve the following python programming problem given the following code:
def getSubConnectionsByConnectionKey(self, service_connection_key) : 
    def gotResult(rows) : 
        def gotSubConns(results) : 
            if all ([r [0] for r in results]) : 
                return [r [1] for r in results] 
else : 
                return defer.fail (('Error retrieving one or more subconnections: %s' % str (results))) 
defs = [self.getSubConnection (r ['provider_nsa'], r ['connection_id']) for r in rows] 
        return defer.DeferredList (defs).addCallback (gotSubConns) 
dbconfig = database.Registry.getConfig () 
    d = dbconfig.select ('sub_connections', where = ['service_connection_id = ?', service_connection_key], select = 'provider_nsa, connection_id') 
    d.addCallback (service_connection_key) 
    return d 

    
    

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

d.addCallback (def gotResult()