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[news.eclipse.tools] Problem launching sample plugin

Hello,
I am using the PDE to write the sample xyz plugin as documented in the R9
PDE Guide.  AFter write the plugin.xml and the action class, I clicked on
the running man icon, and the debug console spilled this error:

Exception launching the Eclipse Platform UI:
java.lang.reflect.InvocationTargetException:
java.lang.reflect.InvocationTargetException: java.lang.NullPointerException
	at
org.eclipse.core.internal.runtime.InternalPlatform.activateDefaultPlugins(InternalPlatform.java:100)
	at
org.eclipse.core.internal.runtime.InternalPlatform.loaderStartup(InternalPlatform.java:530)
	at java.lang.reflect.Method.invoke(Native Method)
	at
org.eclipse.core.internal.boot.InternalBootLoader.startup(InternalBootLoader.java:912)
	at
org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:803)

In my Window-->Preferences --> plugin development, I have
Platform home as D:\Program Files\IBM\WebSphere Studio Application
Developer
Workspace Location as D:\Program Files\IBM\WebSphere Studio Application
Developer\workspace\com.example.xyz

Any help is greatly appreciated.
Regards
Terry