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log4j:ERROR Could not instantiate class

 
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While running my log file i got error like this.how can i rectify this problem?

Configure logging: file:///C:/Program Files/Wowza Media Systems/Wowza Media Server 2.2.3_1/conf/log4j.properties
log4j:ERROR Could not instantiate class [com.wowza.wms.plugin.logging.WowzaAppender].
java.lang.ClassNotFoundException: com.wowza.wms.plugin.logging.WowzaAppender
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 java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.apache.log4j.helpers.Loader.loadClass(Unknown Source)
at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(Unknown Source)
at org.apache.log4j.helpers.OptionConverter.instantiateByKey(Unknown Source)
at org.apache.log4j.PropertyConfigurator.parseAppender(Unknown Source)
at org.apache.log4j.PropertyConfigurator.parseCategory(Unknown Source)
at org.apache.log4j.PropertyConfigurator.configureRootCategory(Unknown Source)
at org.apache.log4j.PropertyConfigurator.doConfigure(Unknown Source)
at org.apache.log4j.PropertyConfigurator.configure(Unknown Source)
at com.wowza.wms.logging.WMSLoggerFactory.initializeLogging(Unknown Source)
at com.wowza.wms.logging.WMSLoggerFactory.initializeLogging(Unknown Source)
at com.wowza.wms.server.Server.initLogging(Unknown Source)
at com.wowza.wms.server.Server.start(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.wowza.wms.bootstrap.Bootstrap.startServer(Bootstrap.java:249)
at com.wowza.wms.bootstrap.Bootstrap.main(Bootstrap.java:48)
log4j:ERROR Could not instantiate appender named "serverAccess".
 
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