Помогите Крашает плагин чата

[Async Chat Thread - #0/ERROR]: Could not pass event AsyncPlayerChatEvent to DMChat v1.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:74) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:499) [craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.PlayerConnection.chat(PlayerConnection.java:1111) [craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1026) [craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.PacketPlayInChat$1.run(PacketPlayInChat.java:39) [craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_222]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_222]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_222]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_222]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.lang.NoClassDefFoundError: ru/lyooxa/core/Core
at ru.lyooxa.chat.ChatListener.onChat(ChatListener.java:78) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
... 12 more
Caused by: java.lang.ClassNotFoundException: ru.lyooxa.core.Core
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_222]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:102) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:87) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_222]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_222]
at ru.lyooxa.chat.ChatListener.onChat(ChatListener.java:78) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_222]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_222]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_222]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_222]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[craftbukkit.jar:git-PaperSpigot-"4c7641d"]
... 12 more

 

ядро сервера какое ?