at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:711)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:676)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:669)
        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:84)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:105)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:451)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
Caused by: java.lang.NumberFormatException: For input string: "jer"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:481)
        at java.lang.Short.parseShort(Short.java:114)
        at java.lang.Short.parseShort(Short.java:139)
        at ka.bob.CheeseMod.CheeseCommand.perform(CheeseCommand.java:1264)
        at ka.bob.CheeseMod.CheeseMod.onCommand(CheeseMod.java:225)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
        ... 12 more