Error

2013-02-24 02:59:44 [SEVERE] Error occurred while enabling QuickShop v3.7.1 (Is it up to date?)
java.lang.ExceptionInInitializerError
	at net.minecraft.server.v1_4_R1.StatisticList.<clinit>(SourceFile:64)
	at net.minecraft.server.v1_4_R1.Block.<clinit>(SourceFile:380)
	at net.minecraft.server.v1_4_R1.ItemSpade.<clinit>(SourceFile:6)
	at net.minecraft.server.v1_4_R1.Item.<clinit>(SourceFile:92)
	at net.minecraft.server.v1_4_R1.ItemStack.getItem(SourceFile:80)
	at net.minecraft.server.v1_4_R1.ItemStack.createStack(SourceFile:66)
	at org.maxgamer.QuickShop.Util.NMS$4.getItemStack(NMS.java:167)
	at org.maxgamer.QuickShop.Util.NMS.getItemStack(NMS.java:224)
	at org.maxgamer.QuickShop.Util.Util.getItemStack(Util.java:219)
	at org.maxgamer.QuickShop.QuickShop.onEnable(QuickShop.java:179)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:383)
	at org.bukkit.craftbukkit.v1_4_R1.v1_4_R1.CraftServer.loadPlugin(CraftServer.java:304)
	at org.bukkit.craftbukkit.v1_4_R1.v1_4_R1.CraftServer.enablePlugins(CraftServer.java:286)
	at net.minecraft.server.v1_4_R1.v1_4_R1.MinecraftServer.j(MinecraftServer.java:327)
	at net.minecraft.server.v1_4_R1.v1_4_R1.MinecraftServer.e(MinecraftServer.java:306)
	at net.minecraft.server.v1_4_R1.v1_4_R1.MinecraftServer.a(MinecraftServer.java:265)
	at net.minecraft.server.v1_4_R1.v1_4_R1.DedicatedServer.init(DedicatedServer.java:153)
	at net.minecraft.server.v1_4_R1.v1_4_R1.MinecraftServer.run(MinecraftServer.java:405)
	at net.minecraft.server.v1_4_R1.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at net.minecraft.server.v1_4_R1.ItemStack.<init>(SourceFile:46)
	at net.minecraft.server.v1_4_R1.Achievement.<init>(SourceFile:16)
	at net.minecraft.server.v1_4_R1.AchievementList.<clinit>(SourceFile:20)
	... 21 more