Staff Info Error

02:31 PM [SEVERE] Error occurred while enabling Staff_Info v1.1 (Is it up to date?)
Caused by: java.lang.IllegalStateException: Initial initialization
	at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:101)
	at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:59)
	at net.milkbowl.vault.Vault.<init>(Vault.java:113)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:313)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:236)
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.java:350)
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.<init>(CraftServer.java:312)
	at net.minecraft.server.v1_7_R1.PlayerList.<init>(PlayerList.java:63)
	at net.minecraft.server.v1_7_R1.DedicatedPlayerList.<init>(SourceFile:14)
	at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:126)
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:424)
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)