Question AutoRestart plugin Popups not working

[Icoryx]

Hi,

I have a problem using the AutoRestart plugin. Usually before the Server restarts it sends a broadcast message saying something like "Server Restarting in X Minutes" but on my Server that isn't working. Ingame you see nothing when the message should show and in the server console it sends an error message:

https://imgur.com/i80P8Ky

There is already a thread on the plugins official gitlab page but I think the plugin isn't getting updated anymore and the thread hasn't gotten any response after 6 months so hopefully someone here can tell me how I can fix this. Maybe even edit the code if needed.

I'd upload a logfile but it contains public IPs. Also the Screenshot above shows almost everything you get. The only other message is the headsup that AutoRestart is a legacy plugin.

Just incase, here's my Server specs:
Ubuntu 18.04.6 LTS
32 GB RAM but I limited paper to 2-8 GB
12 Core 2.5 GHz CPU

Paper Version:
1.19-43

Other installed plugins:
AngelChest
BetterSleeping4
dynmap
LuckPerms
SmoothTimber