I used to host my MC server on FreeMCServer.net, but it was too laggy and did not support my server load well enough, so I recently migrated to Falix.net. PlasmoVoice used to work fine on my server on FMCS, but now it gives me an error saying "UDP server not connected" and then another below it that says something like "Java [exception]: Port occupied/in use". I'm a huge techie so I found it surprising that I worked on this for 3 hours straight and couldn't fix it. I've tried resetting the config file, editing it, or deleting it entirely, but it has not started working again yet. I believe it was working on the Falix server for a short time before failing. I have also tried moving my server to a new node, port, and IP, but it has yet to show any improvement. I am going to try again today, but I don't think it will fix itself that easily. I am on a FML-Modded Forge Server on 1.19.2, and I have other mods installed. None of them are conflicting with PlasmoVoice.

From the wiki and the guide for SVC (PV and SVC both works on UDP, so any guide for SVC should work for PV), you need to allocate extra port and set it to host.port in the config file.
If it doesn't work, contact hosting provider support, most likely it's the issue from their side.

Oh thank you, it worked! I allocated an extra TCP port on my server. It works now! Thank you so much, so glad to have my horror Minecraft server working at its full again!