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java.lang.NullPointerException: 	at org.richfaces.skin.SkinFactoryImpl.clearSkinCaches(SkinFactoryImpl.java:95)	at org.richfaces.skin.SkinFactoryPreRenderViewListener.processEvent(SkinFactoryPreRenderViewListener.java:35)	at javax.faces.event.SystemEvent.processListener(SystemEvent.java:40)	at javax.faces.event.ComponentSystemEvent.processListener(ComponentSystemEvent.java:51)	at org.apache.myfaces.application.ApplicationImpl._traverseListenerList(ApplicationImpl.java:2595)	at org.apache.myfaces.application.ApplicationImpl.access$000(ApplicationImpl.java:129)	at org.apache.myfaces.application.ApplicationImpl$SystemListenerEntry.publish(ApplicationImpl.java:2784)	at org.apache.myfaces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:610)	at org.apache.myfaces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:625)	at javax.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:334)	at javax.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:334)	at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:84)	at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:267)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:200)	at org.richfaces.webapp.ResourceServlet.httpService(ResourceServlet.java:129)	at org.richfaces.webapp.ResourceServlet.service(ResourceServlet.java:123)	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)