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java.lang.NullPointerException: 	at org.primefaces.component.datatable.DataTable.findColumnInGroup(DataTable.java:905)	at org.primefaces.component.datatable.DataTable.findColumn(DataTable.java:896)	at org.primefaces.component.datatable.DataTable.getSortColumn(DataTable.java:1401)	at org.primefaces.component.datatable.feature.SortFeature.singleSort(SortFeature.java:136)	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:1863)	at com.sun.faces.facelets.component.RepeatRenderer.encodeChildren(RepeatRenderer.java:104)	at com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:621)	at com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:1110)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)	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:1856)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)