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java.lang.NullPointerException: 	at com.jfoenix.skins.JFXTreeTableCellSkin.leftLabelPadding(JFXTreeTableCellSkin.java:93)	at com.sun.javafx.scene.control.skin.LabeledSkinBase.computePrefWidth(LabeledSkinBase.java:731)	at com.sun.javafx.scene.control.skin.TableCellSkinBase.computePrefWidth(TableCellSkinBase.java:153)	at javafx.scene.control.Control.computePrefWidth(Control.java:537)	at javafx.scene.Parent.prefWidth(Parent.java:915)	at javafx.scene.layout.Region.prefWidth(Region.java:1419)	at com.sun.javafx.scene.control.skin.TreeTableViewSkin.resizeColumnToFitContent(TreeTableViewSkin.java:333)	at com.sun.javafx.scene.control.skin.TreeTableViewSkin.resizeColumnToFitContent(TreeTableViewSkin.java:56)	at com.sun.javafx.scene.control.skin.TableColumnHeader.doColumnAutoSize(TableColumnHeader.java:531)	at com.sun.javafx.scene.control.skin.TableColumnHeader.updateScene(TableColumnHeader.java:474)	at com.sun.javafx.scene.control.skin.TableColumnHeader.handlePropertyChanged(TableColumnHeader.java:314)	at com.sun.javafx.scene.control.skin.TableColumnHeader.lambda$new$49(TableColumnHeader.java:149)	at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)	at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)	at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)	at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)	at javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)	at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)	at javafx.scene.Node$ReadOnlyObjectWrapperManualFire.fireSuperValueChangedEvent(Node.java:831)	at javafx.scene.Node.invalidatedScenes(Node.java:883)	at javafx.scene.Node.setScenes(Node.java:921)	at javafx.scene.Parent$1.onChanged(Parent.java:269)	at com.sun.javafx.collections.TrackableObservableList.lambda$new$19(TrackableObservableList.java:45)	at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329)	at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)	at javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)	at javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)	at javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)	at javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)	at javafx.collections.ModifiableObservableListBase.setAll(ModifiableObservableListBase.java:90)	at com.sun.javafx.collections.VetoableListDecorator.setAll(VetoableListDecorator.java:116)	at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.updateContent(NestedTableColumnHeader.java:487)	at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.updateTableColumnHeaders(NestedTableColumnHeader.java:317)	at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.checkState(NestedTableColumnHeader.java:544)	at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.computePrefHeight(NestedTableColumnHeader.java:427)	at javafx.scene.Parent.prefHeight(Parent.java:929)	at javafx.scene.layout.Region.prefHeight(Region.java:1435)	at com.sun.javafx.scene.control.skin.TableHeaderRow.computePrefHeight(TableHeaderRow.java:331)	at com.sun.javafx.scene.control.skin.TableHeaderRow.computeMinHeight(TableHeaderRow.java:324)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.control.SkinBase.computeMinHeight(SkinBase.java:254)	at javafx.scene.control.Control.computeMinHeight(Control.java:489)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.layout.AnchorPane.computeHeight(AnchorPane.java:297)	at javafx.scene.layout.AnchorPane.computeMinHeight(AnchorPane.java:246)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.layout.Region.computeChildMinAreaHeight(Region.java:1697)	at javafx.scene.layout.Region.getMaxAreaHeight(Region.java:1978)	at javafx.scene.layout.Region.computeMaxMinAreaHeight(Region.java:1851)	at javafx.scene.layout.StackPane.computeMinHeight(StackPane.java:289)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at com.sun.javafx.scene.control.skin.SplitPaneSkin.computeMinHeight(SplitPaneSkin.java:863)	at javafx.scene.control.Control.computeMinHeight(Control.java:489)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.layout.AnchorPane.computeHeight(AnchorPane.java:297)	at javafx.scene.layout.AnchorPane.computeMinHeight(AnchorPane.java:246)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.layout.Region.computeChildMinAreaHeight(Region.java:1697)	at javafx.scene.layout.BorderPane.getAreaHeight(BorderPane.java:618)	at javafx.scene.layout.BorderPane.computeMinHeight(BorderPane.java:415)	at javafx.scene.Parent.minHeight(Parent.java:957)	at javafx.scene.layout.Region.minHeight(Region.java:1401)	at javafx.scene.layout.BorderPane.layoutChildren(BorderPane.java:485)	at javafx.scene.Parent.layout(Parent.java:1087)	at javafx.scene.Scene.doLayoutPass(Scene.java:552)	at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2397)	at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)	at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)	at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)	at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)