Describes the cause and action for error messages.
Error Message(English)：
pages 404 not found
Official documentation link currently a GitHub 404 page ・ Issue #410 ...
https://github.com/brendanhay/amazonka/issues/410
GitHub Metadata Warnings/Errors ・ Issue #570 ・ mmistakes/minimal ...
https://github.com/mmistakes/minimal-mistakes/issues/570
Jekyll with GitHub Enterprise - Stack Overflow
https://stackoverflow.com/questions/40194732/jekyll-with-github-enterprise
はてなブックマーク - Emacsのバージョン | Emacs JP
http://b.hatena.ne.jp/entry/s/emacs-jp.github.io/tips/versions.html
はてなブックマーク - Emacsのバージョン | Emacs JP
http://b.hatena.ne.jp/entry/4663092325392332993/comment/mkt
44 Best 404 Error Page images | Diseno de paginas, Diseno creativo ...
https://www.pinterest.jp/bokehstory/404-error-page/
Enhance Magento 404 page ? Inchoo
https://inchoo.net/magento/enhance-magento-404-page/
customize error handling with ez platform - The eZ Publish Community
http://share.ez.no/forums/ez-platform/customize-error-handling-with-ez-platform
IP Geo Block - WordPress
https://ja.wordpress.org/plugins/ip-geo-block/