Trouble Running a Eclipse/WOLips Project

Hello All,

I am a new WebObjects user trying to get up the learning-curve by 
practicing some of the demo examples in various WO books (WO for Mac 
OSX-PeachPit Press and Practical WebObjects-Apress).

I've run into a road-block when  trying to run the demo examples in the 
Practical WebObjects book using the Eclipse/WOLips IDE. The error log gives:

!MESSAGE An internal error occurred during: "Launching".\
!STACK 0\
java.lang.NullPointerException\
   at 
org.objectstyle.wolips.launching.delegates.WOJavaLocalApplicationLaunchConfigurationDelegate.verifyWorkingDirectory(WOJavaLocalApplicationLaunchConfigurationDelegate.java:252)\ 

   at 
org.eclipse.jdt.launching.JavaLaunchDelegate.launch(JavaLaunchDelegate.java:53)\ 

   at 
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:639)\ 

   at 
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:565)\ 

   at 
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:754)\ 

   at 
org.eclipse.debug.internal.ui.DebugUIPlugin$6.run(DebugUIPlugin.java:944)\
   at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)
  
My configuration is Eclipse 3.2.1/WOLips 2.0.0.3686/Mac OSX 10.4.8/WO 5.2.

Can anyone help me with a suggestion as to what is the cause of this 
error, and/or how to deal with this problem?

Thanks
Fred Shurleff