ConstructionSites Error

[18:52:31 INFO]: lemons741 issued server command: /construct build test1
[18:52:31 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'construct' in plugin ConstructionSites v0.9
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
Caused by: java.lang.NoClassDefFoundError: com/sk89q/worldedit/FilenameException
        at com.Hand.Sites.Commands.ConstructCmd.onCommand(ConstructCmd.java:136) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        ... 13 more
Caused by: java.lang.ClassNotFoundException: com.sk89q.worldedit.FilenameException
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_66]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
        at com.Hand.Sites.Commands.ConstructCmd.onCommand(ConstructCmd.java:136) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.7.9.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        ... 13 more