ASkyBlockError

[20:17:22 INFO]: GuillermoCRS issued server command: /is help
[20:17:22 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'is' in plugin ASkyBlock v3.0.6.2
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:650) ~[spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1354) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1189) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
        at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.NumberFormatException: For input string: "<2>"
        at java.lang.NumberFormatException.forInputString(Unknown Source) ~[?:1.8.0_121]
        at java.lang.Integer.parseInt(Unknown Source) ~[?:1.8.0_121]
        at java.lang.Integer.valueOf(Unknown Source) ~[?:1.8.0_121]
        at com.wasteofplastic.askyblock.commands.IslandCmd.onCommand(IslandCmd.java:1557) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.11.2.jar:git-Spigot-54ec0b8-0ab6986]
        ... 15 more