java.lang.ClassNotFoundException: com.earth2me.essentials.NpcManager
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:30)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
        at com.earth2me.essentials.Essentials.loadClasses(Essentials.java:68)
        at com.earth2me.essentials.protect.EssentialsProtectBlockListener.onBlockDamage(EssentialsProtectBlockListener.java:54)
        at org.bukkit.plugin.java.JavaPluginLoader$22.execute(JavaPluginLoader.java:231)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:60)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:214)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:359)
        at net.minecraft.server.Packet14BlockDig.a(SourceFile:42)
        at net.minecraft.server.NetworkManager.a(SourceFile:232)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:74)
        at net.minecraft.server.NetworkListenThread.a(SourceFile:104)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:317)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:232)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)