I get this error when I use any worldedit command or right and left click any block:
java.lang.NoClassDefFoundError: org/bukkit/BlockChangeDelegate
at com.sk89q.worldedit.bukkit.BukkitPlayer.getWorld(BukkitPlayer.java:110)
at com.sk89q.worldedit.WorldEdit.handleCommand(WorldEdit.java:831)
at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:175)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:17)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:76)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:158)
at net.minecraft.server.NetServerHandler.c(NetServerHandler.java:578)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:557)
at net.minecraft.server.Packet3Chat.a(SourceFile:24)
at net.minecraft.server.NetworkManager.a(SourceFile:232)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:70)
at net.minecraft.server.NetworkListenThread.a(SourceFile:104)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:276)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:202)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)
Caused by: java.lang.ClassNotFoundException: org.bukkit.BlockChangeDelegate
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:30)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
... 15 more