Openfire Down.

My openfire is Down and the only error that appear in /var/log/openfire/error.log is:

2011.11.01 09:41:58 org.jivesoftware.openfire.container.PluginManager - Error loading plugin: /usr/share/openfire/plugins/webchat

java.lang.NoClassDefFoundError: org/mortbay/jetty/servlet/Context

        at java.lang.Class.getDeclaredConstructors0(Native Method)

        at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)

        at java.lang.Class.getConstructor0(Class.java:2699)

        at java.lang.Class.newInstance0(Class.java:326)

        at java.lang.Class.newInstance(Class.java:308)

        at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java :420)

        at org.jivesoftware.openfire.container.PluginManager.access$300(PluginManager.java :80)

        at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:1067)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)

        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)

        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)

        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101 (ScheduledThreadPoolExecutor.java:98)

        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodi c(ScheduledThreadPoolExecutor.java:180)

        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Schedu ledThreadPoolExecutor.java:204)

        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java: 886)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

        at java.lang.Thread.run(Thread.java:662)

Caused by: java.lang.ClassNotFoundException: org.mortbay.jetty.servlet.Context

        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)

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

        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

        ... 17 more

The system is Debian Squeeze, and because this error (or not) i can't go inside Web Admin interface. The 9090 and 9091 are opened but connection don't complete.

Some help here, please.