[16:17:30] [Server thread/ERROR]: Could not load 'plugins\PlayerSkull2Skin.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:293) [PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:202) [PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:563) [PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_77]
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:123) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at com.gmail.plasmavn.Main.<init>(Main.java:19) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_77]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_77]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_77]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_77]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_77]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:77) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	... 6 more
Caused by: java.lang.IllegalStateException: Initial initialization
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:126) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at com.gmail.plasmavn.Main.<init>(Main.java:19) ~[?:?]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_77]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_77]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_77]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_77]
	at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_77]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:77) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[PaperSpigot.jar:git-PaperSpigot-"5c510af"]
	... 6 more