[22:29:00] [Server thread/ERROR]: Could not load 'plugins\MonsterApocalypseNether.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot.jar:git-Spigot-1371]
	at org.bukkit.craftbukkit.v1_7_R2.CraftServer.loadPlugins(CraftServer.java:355) [spigot.jar:git-Spigot-1371]
	at net.minecraft.server.v1_7_R2.DedicatedServer.init(DedicatedServer.java:135) [spigot.jar:git-Spigot-1371]
	at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java:440) [spigot.jar:git-Spigot-1371]
	at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:618) [spigot.jar:git-Spigot-1371]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:98) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:59) ~[spigot.jar:git-Spigot-1371]
	at blainicus.MonsterApocalypse.MonsterApocalypse.<init>(MonsterApocalypse.java:42) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_51]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_51]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_51]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_51]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_51]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[spigot.jar:git-Spigot-1371]
	... 6 more
Caused by: java.lang.IllegalStateException: Initial initialization
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:59) ~[spigot.jar:git-Spigot-1371]
	at blainicus.MonsterApocalypse.MonsterApocalypse.<init>(MonsterApocalypse.java:42) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_51]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_51]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.7.0_51]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.7.0_51]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_51]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) ~[spigot.jar:git-Spigot-1371]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[spigot.jar:git-Spigot-1371]
	... 6 more