BUG: Unclear error reporting when groupby apply func is wrong

[ChengjieLi28]

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import xorbits.pandas as pd

df = pd.DataFrame({'a': [20200101], "b": ["test"]})

def t(x):
    # should be startswith
    return x[x.str.starts_with("te")].count()

print(df.groupby("a", as_index=False)["b"].apply(t))

The example above raises:

TypeError: Cannot determine dtypes by calculating with enumerate data, please specify it as arguments

However, this is just a typo error in udf t. The error message is unclear.