cant create a new Arena with command: /splatarena new i selected the area with world edit

[Former user]

command: /splatarena new

org.bukkit.command.CommandException: Unhandled exception executing 'splatarena new' in com.shortcircuit.splatoon.commands.ArenaCommand(splatoonarena) at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:148) ~[spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:646) ~[spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1115) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:950) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:26) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(PacketPlayInChat.java:53) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_73] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_73] at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:696) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537) [spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] at java.lang.Thread.run(Thread.java:745) [?:1.8.0_73] Caused by: java.lang.NullPointerException at com.shortcircuit.splatoon.commands.ArenaCommand.createArena(ArenaCommand.java:102) ~[?:?] at com.shortcircuit.splatoon.commands.ArenaCommand.exec(ArenaCommand.java:87) ~[?:?] at com.shortcircuit.utils.bukkit.command.BaseCommand.execute(BaseCommand.java:108) ~[?:?] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-R0.1-b73910a7b7d.jar:git-Spigot-b73910a-aa92a45] ... 13 more