org.eclipse.swt.SWTException: Subclassing not allowed

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Failed to execute runnable (java.lang.IllegalArgumentException: Argument not valid)
org.eclipse.swt.SWTException: Subclassing not allowed
at org.eclipse.swt.SWT.error(SWT.java:2827)
at org.eclipse.swt.SWT.error(SWT.java:2752)
at org.eclipse.swt.SWT.error(SWT.java:2723)
at org.eclipse.swt.widgets.Widget.error(Widget.java:388)
at org.eclipse.swt.widgets.Decorations.checkSubclass(Decorations.java:236)
at org.eclipse.swt.widgets.Shell.(Shell.java:242)
at org.eclipse.swt.widgets.Shell.(Shell.java:237)
at org.eclipse.swt.widgets.Shell.(Shell.java:190)
at de.kout.wlFxp.swt.MainShell.(MainShell.java:11)
at de.kout.wlFxp.swt.wlFxp.main(wlFxp.java:10)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)

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