Openfire 3.10.0 and websocket

Hi, i'm using openfire 3.9.3 with websocket 0.0.0.6 and everything is fine but when I upgrade to 3.10.0, the websocket plugin fall in error.

2015.05.13 11:55:49 org.jivesoftware.openfire.container.PluginManager - Error loading plugin: C:\Program Files\Openfire\plugins\websockets

java.lang.NoClassDefFoundError: org/eclipse/jetty/websocket/WebSocketServlet

    at java.lang.ClassLoader.defineClass1(Native Method)

    at java.lang.ClassLoader.defineClass(Unknown Source)

    at java.security.SecureClassLoader.defineClass(Unknown Source)

    at java.net.URLClassLoader.defineClass(Unknown Source)

    at java.net.URLClassLoader.access$100(Unknown Source)

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.security.AccessController.doPrivileged(Native Method)

    at java.net.URLClassLoader.findClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at com.ifsoft.websockets.plugin.WebSocketsPlugin.initializePlugin(WebSocketsPlugin .java:58)

    at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java :477)

    at org.jivesoftware.openfire.container.PluginManager.access$300(PluginManager.java :76)

    at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:1068)

    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

    at java.util.concurrent.FutureTask.runAndReset(Unknown Source)

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301 (Unknown Source)

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknow n Source)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.websocket.WebSocketServlet

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.security.AccessController.doPrivileged(Native Method)

    at java.net.URLClassLoader.findClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    ... 22 more

Somebody have an idea why this happen.

I try this on 3 others computers and the same error on all of them.

thanks