Invalid Notebook!
{'cell_type': 'plaintext', 'source': 'plain text', 'metadata': {}, 'id': '108f2907'} is not valid under any of the given schemas Failed validating 'oneOf' in plaintext_cell['properties']['cells']['items']: On instance['cells'][12]: {'cell_type': 'plaintext', 'id': '108f2907', 'metadata': {}, 'source': 'plain text'}