Trying to add folder to library...."Your changes could not be saved." BAD API CALL

Server Version#: LATEST — downloaded from Plex.tv

So i have tried just added a freaking folder to my library…something that you need to do to use the server and i keep just getting this message…“Your changes could not be saved.”

I have tried this on 2 different macs (mini & macbook pro) and a raspberry pi with 3 different browsers. ALL ERROR OUT. Being a developer, i open up the web console and see the problem right here:

POST http://192.168.1.95:32400/library/sections?name=Movies&type=movie&agent=tv.plex.agents.movie&scanner=Plex%20Movie&language=en-US&importFromiTunes=&enableAutoPhotoTags=&location=%2Fmedia%2Fslee%2Fmedia%2FVideo%2FMovies&X-Plex-Product=Plex%20Web&X-Plex-Version=4.87.2&X-Plex-Client-Identifier=j20ifxnbb4sqpaeb6ol1u93c&X-Plex-Platform=Chrome&X-Plex-Platform-Version=108.0&X-Plex-Features=external-media%2Cindirect-media%2Chub-style-list&X-Plex-Model=bundled&X-Plex-Device=OSX&X-Plex-Device-Name=Chrome&X-Plex-Device-Screen-Resolution=933x852%2C1680x1050&X-Plex-Token=UZNorjNVya3myrdxZyRc&X-Plex-Language=en 400 (Bad Request)

Something is wrong with either the API call or the API itself. Not sure if there is even a workaround here without getting Plex involved but if anyone has a solution here, please help!

Side note…i pay for this product. it really freaking sucks that it’s impossible to contact Plex itself when we run into a bug that stops us from using it.

Same here reported by one of our users and replicated. Server logs show

Feb 20, 2023 18:24:39.896 [0x7f2c270c2b38] ERROR - [Req#22b] Library: Couldn't create section: 'agent' is missing or invalid
Feb 20, 2023 18:24:39.896 [0x7f2c270c2b38] ERROR - [Req#22b] Library: Couldn't create section: 'language' is invalid

Restarting the service once solves the issue. The secondly errors in browser console remain, but seem to be not related.

systemctl restart plexmediaserver