Residence Error

7:10:48 [SEVERE] null
rg.bukkit.command.CommandException: Unhandled exception executing command 'res'
in plugin Residence v2.4.2
       at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
       at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:16
)
       at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:3
8)
       at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.
ava:757)
       at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:722)

       at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:715)
       at net.minecraft.server.Packet3Chat.a(Packet3Chat.java:33)
       at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
       at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:93)
       at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
       at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:527)
       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
       at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
aused by: java.lang.NoClassDefFoundError: net/minecraft/server/FontAllowedChara
ters
       at com.bekvon.bukkit.residence.Residence.validString(Residence.java:339)

       at com.bekvon.bukkit.residence.Residence.validName(Residence.java:332)
       at com.bekvon.bukkit.residence.protection.ResidenceManager.addResidence(
esidenceManager.java:158)
       at com.bekvon.bukkit.residence.Residence.onCommand(Residence.java:759)
       at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
       ... 12 more
aused by: java.lang.ClassNotFoundException: net.minecraft.server.FontAllowedCha
acters
       at java.net.URLClassLoader$1.run(Unknown Source)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(Unknown Source)
       at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
ava:36)
       at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
ava:24)
       at java.lang.ClassLoader.loadClass(Unknown Source)
       at java.lang.ClassLoader.loadClass(Unknown Source)
       ... 17 more