Unknown target name: "era". [docutils]

Process completed with exit code 2.

inconsistent term references in translated message. original: [':meth:`str.lower`', ':keyword:`lambda`', ':func:`operator.attrgetter`', ':func:`operator.itemgetter`', ':func:`operator.methodcaller`', ':ref:`Sorting HOW TO\n<sortinghowto>`'], translated: [':meth:`str.lower`', ':keyword:`lambda`', ':func:`operator.attrgetter`', ':func:`operator.itemgetter`', ':func:`operator.methodcaller`'] [i18n.inconsistent_references]

inconsistent term references in translated message. original: [':ref:`match object <match-objects>`'], translated: [] [i18n.inconsistent_references]

inconsistent term references in translated message. original: [':meth:`~re.Pattern.split`', ':meth:`~str.split`', ':func:`re.split`'], translated: [':meth:`~re.Pattern.split`', ':meth:`~str.split`'] [i18n.inconsistent_references]

inconsistent term references in translated message. original: [':meth:`str.lower`', ':keyword:`lambda`', ':func:`operator.attrgetter`', ':func:`operator.itemgetter`', ':func:`operator.methodcaller`', ':ref:`Sorting HOW TO\n<sortinghowto>`'], translated: [':meth:`str.lower`', ':keyword:`lambda`', ':func:`operator.attrgetter`', ':func:`operator.itemgetter`', ':func:`operator.methodcaller`'] [i18n.inconsistent_references]

inconsistent term references in translated message. original: [':ref:`match object <match-objects>`'], translated: [] [i18n.inconsistent_references]