For two weeks, when I try to go to "Settings" all I get is "Server settings are unavailable."

For two weeks, I have been trying to download an update for Plex Server. When I go to the “Settings” tab, it says “Server settings are unavailable”. Meanwhile, I can’t access any of my media on Plex Media Server.

https://support.plex.tv/articles/204281528-why-am-i-locked-out-of-server-settings-and-how-do-i-get-in/