Hi,
due to some recent changes on the tor project website some URLs in the default tor-exit-notice html file that many exit operators use result in 404s.
To prevent 404 simply add "2019." at the beginning of the URLs.
If you are using ansible-relayor this is fixed in v19.1.5 (released on 2019-04-06). and rerunning the playbook should fix it for you unless you use a custom file via 'tor_exit_notice_file'.
upstream: https://trac.torproject.org/projects/tor/ticket/30052