[17:13:01 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'nick
' in plugin SunnyPvP v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
0) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServe
r.java:703) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:955) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java
:817) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java
:28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat
.java:47) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [craf
tbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
67) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
60) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range:
 14
        at java.lang.String.substring(Unknown Source) ~[?:1.8.0_11]
        at me.sunnypvp.nick.main.onCommand(main.java:60) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        ... 13 more