2012-12-10 14:54:36 [SEVERE] Error occurred while enabling Orebfuscator v1.7.6 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/Block
	at com.lishid.orebfuscator.OrebfuscatorConfig.isBlockTransparent(OrebfuscatorConfig.java:263)
	at com.lishid.orebfuscator.OrebfuscatorConfig.setBlockValues(OrebfuscatorConfig.java:550)
	at com.lishid.orebfuscator.OrebfuscatorConfig.load(OrebfuscatorConfig.java:620)
	at com.lishid.orebfuscator.Orebfuscator.onEnable(Orebfuscator.java:58)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:374)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_4_5.CraftServer.loadPlugin(CraftServer.java:304)
	at org.bukkit.craftbukkit.v1_4_5.CraftServer.enablePlugins(CraftServer.java:286)
	at org.bukkit.craftbukkit.v1_4_5.CraftServer.<init>(CraftServer.java:240)
	at net.minecraft.server.v1_4_5.ServerConfigurationManagerAbstract.<init>(ServerConfigurationManagerAbstract.java:52)
	at net.minecraft.server.v1_4_5.ServerConfigurationManager.<init>(SourceFile:11)
	at net.minecraft.server.v1_4_5.DedicatedServer.init(DedicatedServer.java:111)
	at net.minecraft.server.v1_4_5.MinecraftServer.run(MinecraftServer.java:402)
	at net.minecraft.server.v1_4_5.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.Block
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:34)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 15 more