World Edit Problems

Whenever i try to do anything involving world edit it gives this in the logs

18:19:48 [SEVERE] java.lang.NoClassDefFoundError: net/minecraft/server/Block
18:19:48 [SEVERE] at com.sk89q.worldedit.bukkit.BukkitWorld.isValidBlockTy
pe(BukkitWorld.java:872)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit.getBlock(WorldEdit.java
:414)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit.getBlock(WorldEdit.java
:355)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit.getBlock(WorldEdit.java
:549)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit.getBlockPattern(WorldEd
it.java:608)
18:19:48 [SEVERE] at com.sk89q.worldedit.commands.RegionCommands.set(Regio
nCommands.java:74)
18:19:48 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native M
ethod)
18:19:48 [SEVERE] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown S
ource)
18:19:48 [SEVERE] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unkno
wn Source)
18:19:48 [SEVERE] at java.lang.reflect.Method.invoke(Unknown Source)
18:19:48 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.inv
okeMethod(CommandsManager.java:522)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdi
t.java:241)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit$1.invokeMethod(WorldEdi
t.java:172)
18:19:48 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.exe
cuteMethod(CommandsManager.java:509)
18:19:48 [SEVERE] at com.sk89q.minecraft.util.commands.CommandsManager.exe
cute(CommandsManager.java:425)
18:19:48 [SEVERE] at com.sk89q.worldedit.WorldEdit.handleCommand(WorldEdit
.java:1339)
18:19:48 [SEVERE] at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(
WorldEditPlugin.java:197)
18:19:48 [SEVERE] at com.sk89q.bukkit.util.DynamicPluginCommand.execute(Dy
namicPluginCommand.java:52)
18:19:48 [SEVERE] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCo
mmandMap.java:186)
18:19:48 [SEVERE] at org.bukkit.craftbukkit.v1_4_5.CraftServer.dispatchCom
mand(CraftServer.java:504)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.NetServerHandler.handleCo
mmand(NetServerHandler.java:988)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.NetServerHandler.chat(Net
ServerHandler.java:906)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.NetServerHandler.a(NetSer
verHandler.java:861)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.Packet3Chat.handle(Packet
3Chat.java:44)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.NetworkManager.b(NetworkM
anager.java:290)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.NetServerHandler.d(NetSer
verHandler.java:113)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.ServerConnection.b(Source
File:39)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.DedicatedServerConnection
.b(SourceFile:30)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.MinecraftServer.r(Minecra
ftServer.java:597)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.DedicatedServer.r(Dedicat
edServer.java:222)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.MinecraftServer.q(Minecra
ftServer.java:493)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.MinecraftServer.run(Minec
raftServer.java:426)
18:19:48 [SEVERE] at net.minecraft.server.v1_4_5.ThreadServerApplication.r
un(SourceFile:856)
18:19:48 [SEVERE] Caused by: java.lang.ClassNotFoundException: net.minecraft.ser
ver.Block
18:19:48 [SEVERE] at org.bukkit.plugin.java.PluginClassLoader.findClass0(P
luginClassLoader.java:70)
18:19:48 [SEVERE] at org.bukkit.plugin.java.PluginClassLoader.findClass(Pl
uginClassLoader.java:53)
18:19:48 [SEVERE] at java.lang.ClassLoader.loadClass(Unknown Source)
18:19:48 [SEVERE] at java.lang.ClassLoader.loadClass(Unknown Source)
18:19:48 [SEVERE] ... 33 more

 

The most up to date World Edit on dev doesn't work well with 1.4.5

Try downgrading your server to 1.4.4 until world edit's updated to 1.4.6

 

Wait for the craftbukkit recommended build or wait for sk89q to post a later update.