2012-12-23 14:21:18 [SEVERE] Could not load 'plugins\SignShop.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/inventory/CraftItemStack
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:182)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugins(CraftServer.java:272)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.<init>(CraftServer.java:250)
	at net.minecraft.server.v1_4_6.PlayerList.<init>(PlayerList.java:52)
	at net.minecraft.server.v1_4_6.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:104)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:404)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/inventory/CraftItemStack
	at org.wargamer2010.signshop.SignShop.<init>(SignShop.java:28)
	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 org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:178)
	... 9 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.inventory.CraftItemStack
	at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 15 more