Solved NoClassDefFoundError

And, it's back ;-;
Whenever i use a listener, i get this error:

Code:

[20:05:47] [Server thread/ERROR]: Could not pass event PlayerJoinEvent to OrchestraV2 v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:295) ~[spigot.jar:git-Bukkit-"24557bc"]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Bukkit-"24557bc"]
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:36) ~[spigot.jar:git-Bukkit-"24557bc"]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [spigot.jar:git-Bukkit-"24557bc"]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.PlayerList.onPlayerJoin(PlayerList.java:248) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.PlayerList.a(PlayerList.java:133) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.LoginListener.b(LoginListener.java:81) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.LoginListener.c(LoginListener.java:41) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.NetworkManager.a(NetworkManager.java:150) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.ServerConnection.c(SourceFile:151) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:720) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:600) [spigot.jar:git-Bukkit-"24557bc"]
    at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:508) [spigot.jar:git-Bukkit-"24557bc"]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_40]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class dev.dlange.OrchestraV2.Managers.Manager
    at dev.dlange.OrchestraV2.listeners.JoinListeners.onJoin(JoinListeners.java:68) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_40]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_40]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:293) ~[spigot.jar:git-Bukkit-"24557bc"]
    ... 15 more

Oh wait don't worry xD i was being stupid and made a static instance of my core class ;-; Don't comment <3

EDIT by Moderator: merged posts, please use the edit button instead of double posting.