Error raised for unsupported Numba engine routines.
>>> df = pd.DataFrame({"key": ["a", "a", "b", "b"], "data": [1, 2, 3, 4]},
... columns=["key", "data"])
>>> def incorrect_function(x):
... return sum(x) * 2.7
>>> df.groupby("key").agg(incorrect_function, engine="numba")
Traceback (most recent call last):
NumbaUtilError: The first 2 arguments to incorrect_function
must be ['values', 'index']
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