[19:14:30] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to HelloWorld v1.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:296) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:156) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:817) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot.jar:git-Spigot-c5146ba-01930e2]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
Caused by: java.lang.NullPointerException
	at me.charlie.helloworld.MyPlayerListener.onPlayerJoin(MyPlayerListener.java:14) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_79]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_79]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_79]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-c5146ba-01930e2]
	... 14 more