Bukkit

What steps will reproduce the problem?
1. Every time  a player joins

Which versionnumber of cTablist are you using?

Latest

Do you have an error log of what happened?
Yes:

[01:07:04] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to cTablist v2.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.PlayerList.c(PlayerList.java:265) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.PlayerList.a(PlayerList.java:152) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.LoginListener.c(LoginListener.java:119) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.LoginListener.a(LoginListener.java:44) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:189) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
Caused by: java.lang.IllegalArgumentException: Player list names can only be a maximum of 16 characters long
    at org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer.setPlayerListName(CraftPlayer.java:194) ~[spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
    at ctablist.src.main.onPlayerJoin(main.java:190) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor410.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot_1649.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]