Additional properties are not allowed ('prompt_number' was unexpected) Failed validating 'additionalProperties' in code_cell: On instance['cells'][3]: {'cell_type': 'code', 'execution_count': None, 'metadata': {'collapsed': False}, 'outputs': ['...0 outputs...'], 'prompt_number': '', 'source': '%%file star-spangled.txt\n' 'These\n' 'are\n' 'not\n' 'the\n' 'words\n' 'of\n' 'the\n' 'star\n' 'spa...'}
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