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org.netbeans.modeler.core.exception.InvalidElmentException: Invalid DB Element	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.attachPinWidget(DBModelerUtil.java:490)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.attachPinWidget(DBModelerUtil.java:122)	at org.netbeans.modeler.scene.vmd.AbstractPModelerScene.attachPinWidget(AbstractPModelerScene.java:248)	at org.netbeans.modeler.scene.vmd.AbstractPModelerScene.attachPinWidget(AbstractPModelerScene.java:96)	at org.netbeans.api.visual.graph.GraphPinScene.addPin(GraphPinScene.java:197)	at org.netbeans.modeler.scene.vmd.AbstractPModelerScene.createPinWidget(AbstractPModelerScene.java:861)	at org.netbeans.modeler.widget.node.vmd.PNodeWidget.createPinWidget(PNodeWidget.java:158)	at org.netbeans.db.modeler.core.widget.table.TableWidget.create(TableWidget.java:179)	at org.netbeans.db.modeler.core.widget.table.TableWidget.addParentAssociationInverseJoinColumn(TableWidget.java:139)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.lambda$loadTable$1(DBModelerUtil.java:337)	at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1612)	at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.loadTable(DBModelerUtil.java:303)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.lambda$loadModelerFileInternal$0(DBModelerUtil.java:197)	at java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1612)	at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.loadModelerFileInternal(DBModelerUtil.java:197)	at org.netbeans.db.modeler.specification.model.util.DBModelerUtil.loadModelerFile(DBModelerUtil.java:178)	at org.netbeans.modeler.core.NBModelerUtil.loadModelerFile(NBModelerUtil.java:57)	at org.netbeans.modeler.specification.model.file.action.ModelerFileActionListener.openModelerFile(ModelerFileActionListener.java:150)	at org.netbeans.db.modeler.specification.model.file.action.DBViewerActionListener.init(DBViewerActionListener.java:59)	at org.netbeans.jpa.modeler.specification.model.util.JPAModelerUtil.openDBViewer(JPAModelerUtil.java:1767)	at org.netbeans.jpa.modeler.listener.ShortcutListener.keyPressed(ShortcutListener.java:43)	at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:249)	at java.awt.Component.processKeyEvent(Component.java:6493)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2832)	at java.awt.Component.processEvent(Component.java:6312)	at java.awt.Container.processEvent(Container.java:2236)	at java.awt.Component.dispatchEventImpl(Component.java:4891)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)	at java.awt.Component.dispatchEventImpl(Component.java:4762)	at java.awt.Container.dispatchEventImpl(Container.java:2294)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4713)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)