java.lang.NullPointerException
        at com.bukkit.authorblues.GroupUsers.GroupUsers.playerCanUseCommand(GroupUsers.java:260)
        at com.sk89q.bukkit.migration.GroupUsersPemissionsResolver.hasPermission(GroupUsersPemissionsResolver.java:58)
        at com.sk89q.bukkit.migration.PermissionsResolverManager.hasPermission(PermissionsResolverManager.java:68)
        at com.sk89q.worldedit.bukkit.WorldEditPlugin.hasPermission(WorldEditPlugin.java:155)
        at com.sk89q.worldedit.bukkit.BukkitPlayer.hasPermission(BukkitPlayer.java:105)
        at com.sk89q.worldedit.WorldEditController.canUseCommand(WorldEditController.java:1882)
        at com.sk89q.worldedit.WorldEditController.handleBlockLeftClick(WorldEditController.java:1968)
        at com.sk89q.worldedit.bukkit.WorldEditBlockListener.onBlockDamage(WorldEditBlockListener.java:55)
        at org.bukkit.plugin.java.JavaPluginLoader.callEvent(JavaPluginLoader.java:176)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:201)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:315)
        at net.minecraft.server.Packet14BlockDig.a(SourceFile:42)
        at net.minecraft.server.NetworkManager.a(SourceFile:232)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:65)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:104)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:261)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:197)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)