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java.lang.NullPointerException: 	at javax.faces.component.UIComponentBase.encodeBegin(Unknown Source)	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(Unknown Source)	at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeChildren(Unknown Source)	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(Unknown Source)	at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeChildren(Unknown Source)	at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(Unknown Source)	at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeAll(Unknown Source)	at javax.faces.render.Renderer.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeChildren(Unknown Source)	at javax.faces.component.UIComponentBase.encodeAll(Unknown Source)	at javax.faces.component.UIComponentBase.encodeAll(Unknown Source)	at javax.faces.component.UIComponentBase.encodeAll(Unknown Source)	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:455)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(Unknown Source)	at com.sun.faces.lifecycle.LifecycleImpl.phase(Unknown Source)	at com.sun.faces.lifecycle.LifecycleImpl.render(Unknown Source)	at javax.faces.webapp.FacesServlet.service(Unknown Source)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Thread.java:595)