java.lang.ClassCastException: org.bukkit.event.server.PluginEvent cannot be cast to org.bukkit.event.server.PluginEnableEvent
        at org.bukkit.plugin.java.JavaPluginLoader$31.execute(JavaPluginLoader.java:350)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:59)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:254)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:512)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:216)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:92)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:70)
        at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:203)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:190)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:130)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:245)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)