[22:40:27 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'simw' in plugin SimpleWelcome v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at org.bukkit.craftbukkit.v1_9_R1.CraftServer.dispatchCommand(CraftServer.java:645) ~[spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1350) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1185) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_91]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_91]
        at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_91]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
        at ru.simplewelcome.commands.onCommand(commands.java:31) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.9-R0.1-SNAPSHOT.jar:git-Spigot-2038f4a-15222c8]
        ... 15 more