points error

[SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'pr' in plugin PointRewards v0.3 beta
>       at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
>       at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
>       at org.bukkit.craftbukkit.v1_5_R1.CraftServer.dispatchCommand(CraftServer.java:514)
>       at net.minecraft.server.v1_5_R1.PlayerConnection.handleCommand(PlayerConnection.java:967)
>       at net.minecraft.server.v1_5_R1.PlayerConnection.chat(PlayerConnection.java:885)
>       at net.minecraft.server.v1_5_R1.PlayerConnection.a(PlayerConnection.java:840)
>       at net.minecraft.server.v1_5_R1.Packet3Chat.handle(Packet3Chat.java:44)
>       at net.minecraft.server.v1_5_R1.NetworkManager.b(NetworkManager.java:292)
>       at net.minecraft.server.v1_5_R1.PlayerConnection.d(PlayerConnection.java:113)
>       at net.minecraft.server.v1_5_R1.ServerConnection.b(SourceFile:35)
>       at net.minecraft.server.v1_5_R1.DedicatedServerConnection.b(SourceFile:30)
>       at net.minecraft.server.v1_5_R1.MinecraftServer.r(MinecraftServer.java:580)
>       at net.minecraft.server.v1_5_R1.DedicatedServer.r(DedicatedServer.java:225)
>       at net.minecraft.server.v1_5_R1.MinecraftServer.q(MinecraftServer.java:476)
>       at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java:409)
>       at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
>       at com.ataxiaserver.topisani.PointRewards.PointRewards.onCommand(PointRewards.java:99)
>       at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
>       ... 15 more