Error Using PrimeFaces

[ashishind]

I am getting the below error in logs while using primefaces , can anybody help

SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED!
Source Document: null
Cause: Class 'org.primefaces.ui.application.PrimeFacesPhaseListener' is not an instance of 'interface javax.faces.event.PhaseListener'
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:213)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:196)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: com.sun.faces.config.ConfigurationException:
Source Document: null
Cause: Class 'org.primefaces.ui.application.PrimeFacesPhaseListener' is not an instance of 'interface javax.faces.event.PhaseListener'
at com.sun.faces.config.processor.AbstractConfigProcessor.createInstance(AbstractConfigProcessor.java:259)
at com.sun.faces.config.processor.LifecycleConfigProcessor.addPhaseListeners(LifecycleConfigProcessor.java:141)
at com.sun.faces.config.processor.LifecycleConfigProcessor.process(LifecycleConfigProcessor.java:114)
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:108)
at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:132)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:203)
... 25 more