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java.lang.NullPointerException: 	at org.primefaces.component.datatable.DataTable.findColumn(DataTable.java:785)	at org.primefaces.component.datatable.DataTable.getSortColumn(DataTable.java:1268)	at org.primefaces.component.datatable.feature.SortFeature.singleSort(SortFeature.java:135)	at org.primefaces.component.datatable.DataTableRenderer.preRender(DataTableRenderer.java:109)	at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:83)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1903)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1899)	at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeTab(AccordionPanelRenderer.java:223)	at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeTabs(AccordionPanelRenderer.java:170)	at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeMarkup(AccordionPanelRenderer.java:103)	at org.primefaces.component.accordionpanel.AccordionPanelRenderer.encodeEnd(AccordionPanelRenderer.java:76)	at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1903)	at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896)	at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:559)	at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)	at javax.faces.component.UIForm.visitTree(UIForm.java:381)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1740)	at com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:399)	at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:319)	at org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60)	at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1896)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:425)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:72)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)	at br.com.gvt.autenticacao.FiltroLogin.doFilter(FiltroLogin.java:27)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)	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$SocketProcessor.run(JIoEndpoint.java:312)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)