Arrow relataed error when pushing dataset to hub

Hello everybody, i have quite a problem with my dataset:

The (future) dataset is a pandas dataframe that i loaded from a pickle file, the pandas dataset behaves correctly. My code is:

dataset.push_to_hub("username/my_dataset", private=True)

because I thought it was pandas fault I also tried:

dataset = Dataset.from_dict(df_sentences.to_dict(orient='list'))
dataset.push_to_hub("username/my_dataset", private=True)

and to load it from file.

The error I get is:

ArrowNotImplementedError: Unhandled type for Arrow to Parquet schema conversion: string

My dataset is composed by 4 columns of type string and one of ints, around 3600 rows

Any suggestion?