human
Solve the following python programming problem given the following code:
def asyncflux_coroutine(f) : 
    'A coroutine that accepts an optional callback.

    Given a callback, the function returns None, and the callback is run
    with (result, error). Without a callback the function returns a Future.
    ' 
    coro = gen.coroutine (wrapper) 
    @ functools.wraps (f) 
    def wrapper(* args, **kwargs) : 
        callback = kwargs.pop ('callback', None) 
        if (callback and (not callable (callback))) : 
            raise TypeError ('callback must be a callable') 
future = coro (* args, ** kwargs) 
        if callback : 
            def _callback(future) : 
                try : 
                    result = future.result () 
                    callback (result, None) 
except Exception as e : 
                    callback (None, e) 
future.add_done_callback (_callback) 
else : 
            return future 
return wrapper 

    
    

    Fix the buggy line: coro = gen.coroutine (wrapper)
assistant
#Here is Python code to fix the buggy line: coro = gen.

coro = gen.coroutine (f)