Invalid Notebook!
{'cell_type': 'future cell', 'metadata': {}, 'key': 'value', 'id': 'c8cb5987'} is not valid under any of the given schemas Failed validating 'oneOf' in future cell_cell['properties']['cells']['items']: On instance['cells'][9]: {'cell_type': 'future cell', 'id': 'c8cb5987', 'key': 'value', 'metadata': {}}