human
Solve the following python programming problem given the following code:
def test_materialize_throw(self) : 
    ex = 'ex' 
    scheduler = TestScheduler () 
    xs = scheduler.create_hot_observable (on_next (150, 1), on_error (250, ex)) 
    def create() : 
        return xs.materialize () 
results = scheduler.start (create).messages 
    assert (len (results) == 2) 
    assert ((results [0].value.kind == 'N') and (create [0].value.value.kind == 'E') and (results [0].value.value.exception == ex)) 
    assert (results [1].value.kind == 'C') 

    
    

    Fix the buggy line: assert ((results [0].value.kind == 'N') and (create [0].value.value.kind == 'E') and (results [0].value.value.exception == ex))
assistant
#Here is Python program to fix the buggy line: assert ((results [0].

assert ((results [0].value.kind == 'N') and (results [0].value.value.kind == 'E') and (results [0].value.value.exception == ex))