Page not found (404)

Request Method: GET
Request URL: http://127.0.0.1:8000/docs/udocs/ru/latest/content/instruments/Ru_LostOrders.html
Raised by: readthedocs.core.views.serve_docs

"/var/www/readthedocs.org/user_builds/udocs/rtd-builds/latest/content/instruments/Ru_LostOrders.html" does not exist

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.