Plugin help

hey im having trouble installing towny please can you help every time i try it does this
2011-11-03 12:15:25 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'town' in plugin Towny v0.77.1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:163)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:355)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java: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:92)
at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:501)
at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:471)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
Caused by: java.lang.NoSuchMethodError: com.nijikokun.register.payment.Method.createAccount(Ljava/lang/String;)Z
at com.palmergames.bukkit.towny.object.TownyEconomyObject.getEconomyAccount(TownyEconomyObject.java:194)
at com.palmergames.bukkit.towny.object.TownyEconomyObject.setBalance(TownyEconomyObject.java:119)
at com.palmergames.bukkit.towny.command.TownCommand.newTown(TownCommand.java:831)
at com.palmergames.bukkit.towny.command.TownCommand.newTown(TownCommand.java:795)
at com.palmergames.bukkit.towny.command.TownCommand.parseTownCommand(TownCommand.java:122)
at com.palmergames.bukkit.towny.command.TownCommand.onCommand(TownCommand.java:93)