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org.eclipse.swt.SWTException: Return value not valid. g_object_get_qdata returned unexpected index value, index: -1, table size: 1024 at org.eclipse.swt.SWT.error(SWT.java:4720) at org.eclipse.swt.widgets.Display.removeWidget(Display.java:4846) at org.eclipse.swt.widgets.Widget.deregister(Widget.java:487) at org.eclipse.swt.widgets.Control.deregister(Control.java:203) at org.eclipse.swt.widgets.Scrollable.deregister(Scrollable.java:191) at org.eclipse.swt.widgets.Composite.deregister(Composite.java:469) at org.eclipse.swt.widgets.Shell.deregister(Shell.java:3082) at org.eclipse.swt.widgets.Widget.releaseWidget(Widget.java:1272) at org.eclipse.swt.widgets.Control.releaseWidget(Control.java:4650) at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:1518) at org.eclipse.swt.widgets.Decorations.releaseWidget(Decorations.java:506) at org.eclipse.swt.widgets.Shell.releaseWidget(Shell.java:3240) at org.eclipse.swt.widgets.Widget.release(Widget.java:1249) at org.eclipse.swt.widgets.Control.release(Control.java:4628) at org.eclipse.swt.widgets.Widget.dispose(Widget.java:529) at org.eclipse.swt.widgets.Shell.dispose(Shell.java:3156) at org.eclipse.swt.widgets.Display.release(Display.java:4480) at org.eclipse.swt.graphics.Device.dispose(Device.java:236) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:181)