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As you can see in this line
Reverse for 'cms_page_unpublish' with arguments '(1, 'en-US')' and keyword arguments '{}' not found. 1 pattern(s) tried: ['en-us/admin/cms/page/([0-9]+)/([a-z\\-]+)/unpublish/$']
arguments for cms_page_unpublish include ‘en-US’ when the only tried ulr template starts with ‘en-us’. Make sure you are not using capitals in the names of languages in settings.py
Source:stackexchange.com