When ever I try starting a faction war, In game it says "An internal error occurred while attempting to preform this command." After that at the same time my console spams me this error. I use Factionwars-UUID 2.4

[03:52:28 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'fw' in plugin FactionWars v2.4
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) ~[server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767) ~[server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1043) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:880) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
at me.philipsnostrum.factionwars.commands.admin.StartCommand.onCommand(StartCommand.java:38) ~[?:?]
at me.philipsnostrum.factionwars.commands.admin.MainCommand.onCommand(MainCommand.java:48) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Spigot-1.7.9-R0.2-208-ge0f2e95]
... 13 more