How can I delete a split wrongly named "all"

[yuanze1024]

I did it using web interface, but it shows:

ValueError: Couldn't infer the same data file format for all splits. Got {'all': (None, {}), 'train': ('parquet', {}), 'test': ('parquet', {}), 'full': ('parquet', {})}

So I put it back. And then it raises

ValueError: `all` is a special split keyword corresponding to the union of all splits, so cannot be used as key in ._split_generator()

Can anyone help? Is there some way to handle it?