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Failed to attach network handler

This server is running Paper version 1.21.11-38-main@4446f17 (2025-12-09T22:51:57Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT) You are running the latest version Previous version: 1.21.10-2531-b7b7ba2 (MC: 1.21.10)

[SystemChat] Failed to attach network handler to "AAS" java.util.NoSuchElementException: Connection not found for key: /127.0.0.1:54532 at SystemChat-1.11.2+1.21.11-paper.jar//me.taucu.systemchat.util.NetworkUtil.getServerConnectionOrThrow(NetworkUtil.java:61) ~[?:?] at SystemChat-1.11.2+1.21.11-paper.jar//me.taucu.systemchat.util.DuplexHandler.get(DuplexHandler.java:79) ~[?:?] at SystemChat-1.11.2+1.21.11-paper.jar//me.taucu.systemchat.SystemChat.attachHandler(SystemChat.java:95) ~[?:?] at SystemChat-1.11.2+1.21.11-paper.jar//me.taucu.systemchat.listeners.PaperEvents.onInitialConnectionConfigure(PaperEvents.java:56) ~[?:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:71) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?] at org.bukkit.event.Event.callEvent(Event.java:46) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?] at net.minecraft.server.network.ServerConfigurationPacketListenerImpl.startConfiguration(ServerConfigurationPacketListenerImpl.java:103) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.server.network.ServerLoginPacketListenerImpl.handleLoginAcknowledgement(ServerLoginPacketListenerImpl.java:420) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.network.protocol.login.ServerboundLoginAcknowledgedPacket.handle(ServerboundLoginAcknowledgedPacket.java:22) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.network.protocol.login.ServerboundLoginAcknowledgedPacket.handle(ServerboundLoginAcknowledgedPacket.java:8) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.network.PacketProcessorListenerAndPacket.handle(PacketProcessor.java:99) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.network.PacketProcessor.executeSinglePacket(PacketProcessor.java:33) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1501) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.server.MinecraftServer.recordTaskExecutionTimeWhileWaiting(MinecraftServer.java:1232) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1343) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at net.minecraft.server.MinecraftServer.lambdaspin$2(MinecraftServer.java:388) ~[paper-1.21.11.jar:1.21.11-38-4446f17] at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]