Hello nathan ^^ .
So.. Im doing a plugin to add your API , The problem is when I try to run all the code executing one command. I have this NPE
[05:22:14 ERROR]: null org.bukkit.command.CommandException: Unhandled exception executing command 'vertarea' in plugin CalificacionLFA v1.0 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:650) ~[spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1354) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1189) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_131] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_131] at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131] Caused by: java.lang.NullPointerException at io.github.amaknajaja.calificacionlfa.Comandos.onCommand(Comandos.java:119) ~[?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.11.2.jar:git-Spigot-3fb9445-6e3cec8] ... 15 more

And always in this line caster.addSkillPoints(10);

I dont understand why i have a NPE when i checked always the null .
Regards!

Done!