un probléme de navigation entre pages jsf qui me gêne

j'ai un probléme de navigation entre pages xhtml , losque je navigue entre pages de mon projet ,une erreur d'ajax (<f:ajax>) qui apparait , voila l'erreur :

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javax.faces.FacesException: java.lang.NullPointerException
	at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1256)
	at javax.faces.component.UIComponentBase.invokeOnComponent(UIComponentBase.java:672)
	at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:284)
	at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:177)
	at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:131)
	at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:430)
	at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:143)
	at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:288)
	at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:199)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
	at com.sun.faces.application.view.StateManagementStrategyImpl$4.invokeContextCallback(StateManagementStrategyImpl.java:289)
	at javax.faces.component.UIComponent.invokeOnComponent(UIComponent.java:1253)

:rouleau::rouleau::rouleau::rouleau::rouleau::rouleau: je demande votre aide mes amis , et merci beacoup