menu error

03:19:04 [INFO] charlie_boi issued server command: /menu create Main 1 Main Menu
03:19:04 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'menu' in plugin CreateYourOwnMenus v0.2
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:523)
        at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:965)
        at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
        at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.IllegalArgumentException: The permission cyom.menu.main is already defined!
        at org.bukkit.plugin.SimplePluginManager.addPermission(SimplePluginManager.java:572)
        at me.xhawk87.CreateYourOwnMenus.CreateYourOwnMenus.createMenu(CreateYourOwnMenus.java:61)
        at me.xhawk87.CreateYourOwnMenus.commands.MenuCreateCommand.onCommand(MenuCreateCommand.java:63)
        at me.xhawk87.CreateYourOwnMenus.commands.MenuCommand.onCommand(MenuCommand.java:63)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 15 more