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java.lang.NullPointerException: 	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:71)	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:73)	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:73)	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:73)	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:73)	at jmri.jmrit.catalog.CatalogTreeModel.insertResourceNodes(CatalogTreeModel.java:73)	at jmri.jmrit.catalog.CatalogTreeModel.(CatalogTreeModel.java:34)	at jmri.jmrit.catalog.CatalogTreeModel.instance(CatalogTreeModel.java:117)	at jmri.jmrit.catalog.CatalogPane.(CatalogPane.java:56)	at jmri.jmrit.display.layoutEditor.MultiIconEditor.(MultiIconEditor.java:37)	at jmri.jmrit.display.layoutEditor.LayoutEditor.(LayoutEditor.java:655)	at jmri.jmrit.display.layoutEditor.configurexml.LayoutEditorXml.load(LayoutEditorXml.java:353)	at jmri.configurexml.ConfigXmlManager.loadOnSwingThread(ConfigXmlManager.java:674)	at jmri.configurexml.ConfigXmlManager.load(ConfigXmlManager.java:586)	at jmri.implementation.JmriConfigurationManager.load(JmriConfigurationManager.java:216)	at jmri.implementation.JmriConfigurationManager.load(JmriConfigurationManager.java:166)	at jmri.implementation.JmriConfigurationManager.load(JmriConfigurationManager.java:156)	at jmri.configurexml.LoadXmlConfigAction.loadFile(LoadXmlConfigAction.java:46)	at jmri.configurexml.LoadXmlUserAction.actionPerformed(LoadXmlUserAction.java:43)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.AbstractButton.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$500(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)