Error occured: NWDS cannot be launched

I shut down my Neweaver Developer Studio, and restart this morning, and I got the following error. I reinstall the studio from the installation file, it still give me the same error. The NWDS platform get launched and encountered errors and shut down itself.
Here is the last error listed in log file (at .metadata folder):
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.reflect.InvocationTargetException
     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)
     at com.sap.ide.eclipse.startup.Main.basicRun(Main.java:291)
     at com.sap.ide.eclipse.startup.Main.run(Main.java:789)
     at com.sap.ide.eclipse.startup.Main.main(Main.java:607)
Caused by: java.lang.reflect.InvocationTargetException
     at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:861)
     at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
     ... 7 more
Caused by: java.lang.NullPointerException
     at org.eclipse.swt.widgets.Table.releaseWidget(Table.java:1089)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Widget.releaseResources(Widget.java:715)
     at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:319)
     at org.eclipse.swt.widgets.Composite.releaseWidget(Composite.java:367)
     at org.eclipse.swt.widgets.Canvas.releaseWidget(Canvas.java:118)
     at org.eclipse.swt.widgets.Decorations.releaseWidget(Decorations.java:615)
     at org.eclipse.swt.widgets.Shell.releaseWidget(Shell.java:709)
     at org.eclipse.swt.widgets.Widget.dispose(Widget.java:372)
     at org.eclipse.swt.widgets.Shell.dispose(Shell.java:472)
     at org.eclipse.swt.widgets.Display.release(Display.java:1779)
     at org.eclipse.swt.graphics.Device.dispose(Device.java:212)
     at org.eclipse.ui.internal.Workbench.run(Workbench.java:1390)
     at com.tssap.util.startup.WBLauncher.run(WBLauncher.java:79)
     at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:858)
     ... 8 more
Thanks for help.

Armin,
I don't have a chance to try this.
I just uninstalled and deleted all the NWDS sources, adn it is working fine now.
Thanks.
Kent

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