GS loc error

21:37:21 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'loc' in plugin GiantShop v0.6.DEV
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:473)
        at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:821)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:781)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:764)
        at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:103)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:34)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
        at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:169)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NullPointerException
        at nl.giantit.minecraft.GiantShop.Locationer.Locationer.onCommand(Locationer.java:56)
        at nl.giantit.minecraft.GiantShop.GiantShop.onCommand(GiantShop.java:131)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
        ... 14 more