15:46:04 [WARNING] WorldEdit: Failed to do NMS access for direct NBT data copy
java.lang.NoClassDefFoundError: net/minecraft/server/NBTBase
	at com.sk89q.worldedit.bukkit.BukkitWorld.getBlock(BukkitWorld.java:989)
	at com.sk89q.worldedit.EditSession.rawGetBlock(EditSession.java:403)
	at com.sk89q.worldedit.EditSession.getBlock(EditSession.java:357)
	at com.sk89q.worldedit.EditSession.setBlock(EditSession.java:254)
	at com.sk89q.worldedit.EditSession.drainArea(EditSession.java:1932)
	at com.sk89q.worldedit.commands.UtilityCommands.drain(UtilityCommands.java:125)
	at sun.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at com.sk89q.minecraft.util.commands.CommandsManager.invokeMethod(CommandsManager.java:522)
	at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdit.java:241)
	at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdit.java:172)
	at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:509)
	at com.sk89q.minecraft.util.commands.CommandsManager.execute(CommandsManager.java:425)
	at com.sk89q.worldedit.WorldEdit.handleCommand(WorldEdit.java:1339)
	at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:197)
	at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginCommand.java:52)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
	at org.bukkit.craftbukkit.v1_4_5.CraftServer.dispatchCommand(CraftServer.java:502)
	at com.earth2me.essentials.EssentialsPlayerListener$6.run(EssentialsPlayerListener.java:494)
	at org.bukkit.craftbukkit.v1_4_5.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_4_5.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.v1_4_5.MinecraftServer.r(MinecraftServer.java:529)
	at net.minecraft.server.v1_4_5.DedicatedServer.r(DedicatedServer.java:222)
	at net.minecraft.server.v1_4_5.MinecraftServer.q(MinecraftServer.java:493)
	at net.minecraft.server.v1_4_5.MinecraftServer.run(MinecraftServer.java:426)
	at net.minecraft.server.v1_4_5.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.NBTBase
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:34)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	... 27 more