getting error for freq a, needed for yearly granularity

[Sanjeev97]

return np.vstack([feat(dates) for feat in time_features_from_frequency_str(freq)])

File "<array_function internals>", line 6, in vstack
File "D:\autoformer\venv\lib\site-packages\numpy\core\shape_base.py", line 282, in vstack
return _nx.concatenate(arrs, 0)
File "<array_function internals>", line 6, in concatenate
ValueError: need at least one array to concatenate

[wuhaixu2016]

Hi, thanks for your response.
You can check whether the timestamp of the data is in the form of 2020-01-01 00:10:00.