Error loading presence plugin

Hi,

we installed the presence plugin on our 3.6.4 Openfire server.

But it looks like it doesn’t start. Here is the putput of the error.log:

2010.10.01 10:23:21 [org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.jav a:507)] Error loading plugin: /usr/share/openfire/plugins/presence
java.lang.ClassNotFoundException: org.jivesoftware.openfire.plugin.PresencePlugin
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java :385)
at org.jivesoftware.openfire.container.PluginManager.access$300(PluginManager.java :47)
at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:1032)
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:181)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Schedu ledThreadPoolExecutor.java:205)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java: 886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Can someone help me to solve this issue?