java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.icesoft.faces.component.ext.renderkit.TableRenderer.processUIColumnsHeader(TableRenderer.java:506)
at com.icesoft.faces.component.ext.renderkit.TableRenderer.renderColumnHeader(TableRenderer.java:239)
at com.icesoft.faces.component.ext.renderkit.TableRenderer.renderFacet(TableRenderer.java:179)
at com.icesoft.faces.renderkit.dom_html_basic.TableRenderer.encodeBegin(TableRenderer.java:110)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
at com.icesoft.faces.component.panelseries.UISeries.encodeBegin(UISeries.java:298)
at com.icesoft.faces.component.ext.HtmlDataTable.encodeBegin(HtmlDataTable.java:98)
at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:344)
at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:84)
at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:346)
at com.icesoft.faces.renderkit.dom_html_basic.DomBasicRenderer.encodeParentAndChildren(DomBasicRenderer.java:353)
at com.icesoft.faces.renderkit.dom_html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:84)
at com.icesoft.faces.component.util.CustomComponentUtils.renderChild(CustomComponentUtils.java:308)
at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.writeTabCell(PanelTabSetRenderer.java:995)
at com.icesoft.faces.component.paneltabset.PanelTabSetRenderer.encodeEnd(PanelTabSetRenderer.java:411)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1763)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)

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