Cannot create library

Server Version#: 1.31.0.6654-02189b09f
Player Version#: N/A

I’ve been using plex for many years. I’m trying to set up a new server and I find that I am unable to create any libraries. Every time I go through the steps to create a library in the web interface, I get the message “Your changes could not be saved.” when I hit the ADD LIBRARY button.

Here’s a sample log entry:

Feb 25, 2023 12:53:56.256 [0x7f3081cc4b38] INFO - Request: [[::1]:45488 (Loopback)] POST /library/sections?name=Music&type=artist&agent=tv.plex.agents.music&scanner=Plex%20Music&language=en&importFromiTunes=&enableAutoPhotoTags=&location=%2Fhome%2Fplex%2FMusic (4 live) #30c GZIP Signed-in Token (jfamundson) (Chrome)
Feb 25, 2023 12:53:56.256 [0x7f3081cc4b38] ERROR - [Req#30c] Library: Couldn’t create section: ‘agent’ is missing or invalid
Feb 25, 2023 12:53:56.256 [0x7f3081cc4b38] ERROR - [Req#30c] Library: Couldn’t create section: ‘language’ is invalid
Feb 25, 2023 12:53:56.256 [0x7f3081cc4b38] ERROR - [Req#30c] Library: Couldn’t create section: new scanner needs to be paired with new agent
Feb 25, 2023 12:53:56.257 [0x7f30831f6b38] INFO - Completed: [[::1]:45488] 400 POST /library/sections?name=Music&type=artist&agent=tv.plex.agents.music&scanner=Plex%20Music&language=en&importFromiTunes=&enableAutoP

Here’s another sample log entry:

Feb 25, 2023 12:32:18.776 [0x7f30820d3b38] INFO - Request: [[::1]:55590 (Loopback)] POST /library/sections?name=Dance&type=movie&agent=com.plexapp.agents.none&scanner=Plex%20Video%20Files%20Scanner&language=xn&importFromiTunes=&enableAutoPhotoTags=&location=%2Fhome%2Fplex%2FVideos%2FDance (4 live) #283 GZIP Signed-in Token (jfamundson) (Chrome)
Feb 25, 2023 12:32:18.776 [0x7f30820d3b38] ERROR - [Req#283] Library: Couldn’t create section: ‘agent’ is missing or invalid
Feb 25, 2023 12:32:18.776 [0x7f30820d3b38] ERROR - [Req#283] Library: Couldn’t create section: ‘language’ is invalid
Feb 25, 2023 12:32:18.777 [0x7f3082ff3b38] INFO - Completed: [[::1]:55590] 400 POST /library/sections?name=Dance&type=movie&agent=com.plexapp.agents.none&scanner=Plex%20Video%20Files%20Scanner&language=xn&importFromiTunes=&enableAutoPhotoTags=&location=%2Fhome%2Fplex%2FVideos%2FDance (4 live) GZIP 1ms 469 bytes (pipelined: 1)

We are investigating why this issue is happening to some folks. We think it is possibly a component not starting properly. For some simply restarting the Plex Media Server app or the device the server is installed on resolves the issue.

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