human
Solve the following python programming problem given the following code:
@ async_test 
def testCreate(self) : 
    alloc = IdAllocator ('type', 13) 
    num_ids = 3000 
    def _OnAllocated(ids) : 
        id_set = set (ids) 
        assert (len (id_set) == num_ids) 
        self.stop () 
with util.ArrayBarrier (_OnAllocated) as b : 
        [alloc.NextId (i._client, callback = b.Callback ()) for i in xrange (num_ids)] 

    
    

    Fix the buggy line: [alloc.NextId (i._client, callback = b.Callback ()) for i in xrange (num_ids)]
assistant
#Here is Python program to fix the buggy line: [alloc.

[alloc.NextId (self._client, callback = b.Callback ()) for i in xrange (num_ids)]