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net/minecraft/server/v1_8_R2/World
java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R3.World	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91)	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at net.aufdemrand.sentry.SentryTrait.ensureInst(SentryTrait.java:134)	at net.aufdemrand.sentry.SentryTrait.onSpawn(SentryTrait.java:116)	at net.citizensnpcs.api.npc.AbstractNPC.addTrait(AbstractNPC.java:110)	at net.citizensnpcs.commands.NPCCommands.create(NPCCommands.java:468)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at net.citizensnpcs.api.command.CommandManager.executeMethod(CommandManager.java:152)	at net.citizensnpcs.api.command.CommandManager.execute(CommandManager.java:87)	at net.citizensnpcs.api.command.CommandManager.executeSafe(CommandManager.java:175)	at net.citizensnpcs.Citizens.onCommand(Citizens.java:237)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:647)	at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1351)	at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1186)	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45)	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1)	at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732)	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400)	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567)	at java.lang.Thread.run(Thread.java:745)