I saw someone else post this same error a few days ago, but not additional messages were related to it.
I've been running rTorrentvpn under a docker container for months now with zero problems. I updated earlier this morning to the latest image and restarted and now my ruTorrent web won't open up correctly. I know my rtorrent client is running, I've got 1000+ torrents seeding and I can see them validated on the trackers without problems.
[07.08.2020 13:53:11] WebUI started.
[07.08.2020 13:53:25] JS error: [http://rutorrent:XXXXX@x.x.x.x:9080/ : 5145] Uncaught TypeError: Cannot read property 'flabel_cont' of undefined