Bukkit

When I load up the server I get:

22:46:06 [SEVERE] Error occurred while enabling xWarp v3.1.6 (Is it up to date?)

java.lang.NoClassDefFoundError: de/xzise/bukkit/util/callback/Callback
at de.xzise.xwarp.wrappers.permission.PermissionTypes.<clinit>(Permissio
nTypes.java:30)
at de.xzise.xwarp.XWarp.onEnable(XWarp.java:59)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:336)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:363)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:249)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:231
)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:356)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:343)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:174)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:407)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.ClassNotFoundException: de.xzise.bukkit.util.callback.Callb
ack
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:41)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:29)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more

What version of the product are you using?
Bukkit 1.1-R6 (Build #1360)
Xwarp version-3-1-6/

I am using PermissionsEx, in my config:

permissions:
plugin: 'PermissionsEx.jar'

Not sure if the error is actually referring to it or not, but did you update your Bukkit Plugin Utilities?

This ticket can be closed the issue was user error:

As per the instructions on the Main Page:

With version 3.0.0 it also needs the Bukkit Plugin Utilities library. Place it near to the SQLite driver in the lib/ directory. Rename it to BukkitPluginUtilities.jar!

Until version 3.1.5 is compatible with all builds since 1.1.0. With version 3.1.6 you have to use 1.3.0-B7

I switched whichever version I had to this exact build and the issue was resolved.

Sorry I did not respond sooner, I did not receive any notifications for this ticket.