Błąd pluginu Citizens

Witam, mam sobie plugin Citizens i przy tworzeniu NPC wywala w konsoli taki błąd

[23:41:17 WARN]: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R1/Packet [23:41:17 WARN]: at net.citizensnpcs.npc.CitizensNPCRegistry.getByType(CitizensNPCRegistry.java:92) [23:41:17 WARN]: at net.citizensnpcs.npc.CitizensNPCRegistry.createNPC(CitizensNPCRegistry.java:47) [23:41:17 WARN]: at net.citizensnpcs.npc.CitizensNPCRegistry.createNPC(CitizensNPCRegistry.java:40) [23:41:17 WARN]: at net.citizensnpcs.commands.NPCCommands.create(NPCCommands.java:324) [23:41:17 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [23:41:17 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [23:41:17 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [23:41:17 WARN]: at java.lang.reflect.Method.invoke(Method.java:606) [23:41:17 WARN]: at net.citizensnpcs.api.command.CommandManager.executeMethod(CommandManager.java:154) [23:41:17 WARN]: at net.citizensnpcs.api.command.CommandManager.execute(CommandManager.java:90) [23:41:17 WARN]: at net.citizensnpcs.api.command.CommandManager.executeSafe(CommandManager.java:178) [23:41:17 WARN]: at net.citizensnpcs.Citizens.onCommand(Citizens.java:236) [23:41:17 WARN]: at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [23:41:17 WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) [23:41:17 WARN]: at org.bukkit.craftbukkit.v1_8_R2.CraftServer.dispatchCommand(CraftServer.java:646) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.PlayerConnection.handleCommand(PlayerConnection.java:1133) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:968) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:1) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13) [23:41:17 WARN]: at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [23:41:17 WARN]: at java.util.concurrent.FutureTask.run(FutureTask.java:262) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:710) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [23:41:17 WARN]: at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [23:41:17 WARN]: at java.lang.Thread.run(Thread.java:745) [23:41:17 WARN]: Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R1.Packet [23:41:17 WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) [23:41:17 WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) [23:41:17 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:425) [23:41:17 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:358) [23:41:17 WARN]: ... 28 more