Additional properties are not allowed ('header' was unexpected) Failed validating 'additionalProperties' in error: On instance['cells'][39]['outputs'][1]: {'ename': '', 'evalue': '', 'header': 'MessageHeader {mhIdentifiers = ' '["6e5dfd26-0203-48bd-895e-eee4970...', 'output_type': 'error', 'traceback': ['<interactive>:1:4: error:\n' ' • No instance for (Fractional Int)...']}
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