NullPointerException in JarClassFinderAction   

I've used the JAR Class Finder on other machines with no problem. However, on a new computer, I'm getting a NullPointerException in JarClassFinderAction. I am using JarClassFinder-2.1.0.jar with Eclipse Version: 3.3.2. In the Java Class Finder dialog box, when I click on the "Browse..." button next to the Search Directory field, I get this exception:

!SESSION 2008-04-14 16:08:03.781

eclipse.buildId=M20080221-1800

java.fullversion=J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20051222 (JIT enabled)

J9VM - 20051220_04469_lHdSMR

JIT  - 20051220_1800_r8

GC   - 20051219_AA

BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US

Command-line arguments:  -os win32 -ws win32 -arch x86 -clean

 

!ENTRY org.eclipse.ui 4 0 2008-04-14 16:08:51.945

!MESSAGE Unhandled event loop exception

!STACK 0

java.lang.NullPointerException

	at com.ibm.hursley.jarclassfinder.ui.JarClassFinderAction$1.widgetSelected(JarClassFinderAction.java:175)

	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)

	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)

	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)

	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)

	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)

	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)

	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)

	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)

	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)

	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)

	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)

	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)

	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)

	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)

	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)

	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)

	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)

	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:615)

	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)

	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)

	at org.eclipse.equinox.launcher.Main.run(Main.java:1173)