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Problem in loadng openfire

it always shows this message

Starting Client Control Plugin

Starting Fastpath Server

log4j:ERROR Could not instantiate class [net.sf.kraken.util.Log4JToOpenfireAppender].

java.lang.ClassNotFoundException: net.sf.kraken.util.Log4JToOpenfireAppender

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 sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

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

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Unknown Source)

at org.apache.log4j.helpers.Loader.loadClass(Loader.java:179)

at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter .java:320)

at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java: 121)

at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:6 64)

at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:6 47)

at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurato r.java:544)

at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440 )

at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:367)

at net.sf.kraken.KrakenPlugin.setLoggerProperty(KrakenPlugin.java:284)

at net.sf.kraken.KrakenPlugin.(KrakenPlugin.java:61)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at java.lang.Class.newInstance0(Unknown Source)

at java.lang.Class.newInstance(Unknown Source)

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(Unknown Source)

at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)

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

at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101 (Unknown Source)

at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodi c(Unknown Source)

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

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

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

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

log4j:ERROR Could not instantiate appender named “openfire”.

log4j:WARN No appenders could be found for logger (org.jivesoftware.util.log.util.CommonsLogFactory).

log4j:WARN Please initialize the log4j system properly.