Failed to load class or interface 'DOMDocument': the class or interface 'DOMDocument' is not defined in the library map for any loaded phutil library.
If you are not a developer, this almost always means that a library is out of date. For example, you may have upgraded `phabricator` without upgrading `libphutil`, or vice versa. It might also mean that you need to restart Apache or PHP-FPM. Make sure all libraries are up to date and all services have been restarted.
If you are a developer and this symbol was recently added or moved, your library map may need to be rebuilt. You can rebuild the map by running 'arc liberate'. For more information, see: