human
Solve the following python programming problem given the following code:
def test_ensure_use_new(self) : 
    class MyClass13 () : 
        def __init__(self) : 
            pass 
code = py2js (MyClass13) 
    err = 'Class constructor is called as a function.' 
    assert (evaljs ((code + 'try { var m = new MyClass13().
"ok"} catch (err) { err.
}')) == 'ok') 
    assert (evaljs ((code + 'try { var m = MyClass13();} catch (err) { err.
}')) == err) 
    assert (evaljs ((err + 'try { MyClass13.apply(root);} catch (err) { err.
}')) == err) 
    assert (evaljs ((code + 'var window = root;try { MyClass13.apply(window);} catch (err) { err.
}')) == err) 

    
    

    Fix the buggy line: assert (evaljs ((err + 'try { MyClass13.apply(root);} catch (err) { err.
}')) == err)
assistant
#Here is Python code to fix the buggy line: assert (evaljs ((err + 'try { MyClass13.

assert (evaljs ((code + 'try { MyClass13.apply(root);} catch (err) { err; }')) == err)