pandas.errors.InvalidIndexError: (slice(None, None, None), slice(None, 3, None))

This error occurs when you try to slice a DataFrame with an invalid index. In this particular case, the error message indicates that there is an issue with the second slice of the DataFrame.

The slice(None, 3, None) portion of the error message indicates that the second slice is trying to select all rows (None to None) and the first three columns.

To fix the error, you may need to check the index of your DataFrame to ensure that it is valid, or adjust the slicing parameters to correctly select the desired subset of the DataFrame.