Similar scenario for me—set up a DVR, moved and didn’t set up the new HDHomeRun tuner again for a while, and when I finally went to set it up, this client side error was happening every time.
Installing the old Plex version on a different machine and using it to delete the old DVR worked for me. These workarounds are pretty ridiculous, though…
A fix for the Unexpected Error when selecting DVR Settings has just been released in hosted Plex Web App version 4.74.1 available through https://app.plex.tv/desktop
See Release Notice
Fixed the DVR and LiveTV settings error if DVR has old and no longer existing lineup
With this fix the settings page will load an allow you to delete the old DVR
Thanks for the info! I’m using headless Ubuntu 20.04, and no matter what update path I try it doesnt go higher than 4.69.1. Is there an estimate on the update finding its way to the Linux distros?
Bundled into Plex Media Server binaries and accessible through http://127.0.0.1:32400/web on the server itself or through its local IP address. The version that is bundled is 4.69.1
2… Hosted and available through https://app.plex.tv/desktop - this is always more up to date and the current version is 4.74.1
The bundled version will get updated some time in the future - but for now please use the hosted Plex Web app for the fix for this issue