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

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java.lang.NullPointerException:
at org.icefaces.component.ext.renderkit.dt.renderer.PassThruAttributeWriter.renderHtmlAttributes(PassThruAttributeWriter.java:71)
at org.icefaces.component.custom.renderkit.dt.renderer.TreeRenderer.encodeBegin(TreeRenderer.java:42)
at com.icesoft.faces.component.tree.Tree.encodeBegin(Tree.java:228)
at org.icefaces.component.ext.renderkit.dt.renderer.GroupRenderer.encodeChildren(GroupRenderer.java:78)
at com.icesoft.faces.component.util.CustomComponentUtils.renderChild(CustomComponentUtils.java:339)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.renderTableCell(PanelBorderRenderer.java:277)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.renderTableCells(PanelBorderRenderer.java:223)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.renderWest(PanelBorderRenderer.java:144)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.renderEastWestCenter(PanelBorderRenderer.java:132)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.renderPanel(PanelBorderRenderer.java:114)
at org.icefaces.component.custom.renderkit.dt.renderer.PanelBorderRenderer.encodeChildren(PanelBorderRenderer.java:88)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderBean(FacesPageUnit.java:1304)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderNode(FacesPageUnit.java:1549)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderBean(FacesPageUnit.java:1337)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderNode(FacesPageUnit.java:1549)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderNode(FacesPageUnit.java:1563)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderNode(FacesPageUnit.java:1563)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.getFacesRenderTree(FacesPageUnit.java:1105)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderHtml(FacesPageUnit.java:1675)
at org.netbeans.modules.visualweb.insync.faces.FacesPageUnit.renderHtml(FacesPageUnit.java:1628)
at org.netbeans.modules.visualweb.insync.models.FacesModel.getHtmlDomFragment(FacesModel.java:1614)
at org.netbeans.modules.visualweb.insync.models.FacesModel.findHtmlBody(FacesModel.java:1638)
at org.netbeans.modules.visualweb.insync.models.FacesModel.getHtmlBody(FacesModel.java:1626)
at org.netbeans.modules.visualweb.designer.jsf.JsfForm.getHtmlBody(JsfForm.java:1755)
at org.netbeans.modules.visualweb.designer.jsf.JsfForm.getHtmlBody(JsfForm.java:1745)
at org.netbeans.modules.visualweb.designer.jsf.DomSynchronizer.processRefresh(DomSynchronizer.java:1484)
at org.netbeans.modules.visualweb.designer.jsf.DomSynchronizer.processUpdates(DomSynchronizer.java:816)
at org.netbeans.modules.visualweb.designer.jsf.DomSynchronizer.run(DomSynchronizer.java:696)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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