I m unable to plugin enterprise in my openfire Server..

Whenever I upload that Enterprise jar file.I found an error in error.log file....Error is look like this.....!

2008.04.17 14:52:12 org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java: 506) Error loading plugin: /usr/share/openfire/plugins/enterprise

java.lang.ClassNotFoundException: com.jivesoftware.openfire.enterprise.EnterprisePlugin

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:306)

at java.lang.ClassLoader.loadClass(ClassLoader.java:251)

at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java :384)

at org.jivesoftware.openfire.container.PluginManager.access$300(PluginManager.java :46)

at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManag er.java:1013)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)

at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:280)

at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:135)

at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101 (ScheduledThreadPoolExecutor.java:65)

at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodi c(ScheduledThreadPoolExecutor.java:142)

at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Schedu ledThreadPoolExecutor.java:166)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java: 650)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)

at java.lang.Thread.run(Thread.java:595)

I also found, There is no package on openfire like  com.jivesoftware.openfire.enterprise.EnterprisePlugin...Plz help me As possible!