ConversionError: The undefined value has no properties. (httpunit; line 675)

Hi, 
   
  I am new in httpunit, I got stuck with some bazaar error.  When I am trying to use button.click(),  I have received error like: ConversionError: The undefined value has no properties. (httpunit; line 675).
   
  Could anyone let me know why?  What other work around I can have, e.g. using a different method or set up some path/classpath, or etc.?  I am using version 1.6.2 on win2k3.  I have tried to attach httpunit.jar to look at the lines in java, but failed.  How should I be able to view the java files in the error?  BTW, I am using Eclipse too.
   
  Thank you so much for the help!
  JC

   
  ConversionError: The undefined value has no properties. (httpunit; line 675)
 at org.mozilla.javascript.NativeGlobal.constructError(NativeGlobal.java:597)
 at org.mozilla.javascript.NativeGlobal.constructError(NativeGlobal.java:557)
 at org.mozilla.javascript.ScriptRuntime.getProp(ScriptRuntime.java:712)
 at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2035)
 at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2163)
 at org.mozilla.javascript.InterpretedScript.call(InterpretedScript.java:62)
 at org.mozilla.javascript.InterpretedScript.exec(InterpretedScript.java:55)
 at org.mozilla.javascript.Context.evaluateReader(Context.java:820)
 at org.mozilla.javascript.Context.evaluateString(Context.java:784)
 at com.meterware.httpunit.javascript.JavaScript$JavaScriptEngine.executeScript(JavaScript.java:132)
 at com.meterware.httpunit.scripting.ScriptableDelegate.runScript(ScriptableDelegate.java:65)
 at com.meterware.httpunit.parsing.ScriptFilter.getTranslatedScript(ScriptFilter.java:151)
 at com.meterware.httpunit.parsing.ScriptFilter.endElement(ScriptFilter.java:131)
 at org.cyberneko.html.filters.DefaultFilter.endElement(Unknown Source)
 at org.cyberneko.html.filters.NamespaceBinder.endElement(Unknown Source)
 at org.cyberneko.html.HTMLTagBalancer.callEndElement(Unknown Source)
 at org.cyberneko.html.HTMLTagBalancer.endElement(Unknown Source)
 at org.cyberneko.html.HTMLScanner$SpecialScanner.scan(Unknown Source)
 at org.cyberneko.html.HTMLScanner.scanDocument(Unknown Source)
 at org.cyberneko.html.HTMLConfiguration.parse(Unknown Source)
 at org.cyberneko.html.HTMLConfiguration.parse(Unknown Source)
 at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
 at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
 at com.meterware.httpunit.parsing.NekoHTMLParser.parse(NekoHTMLParser.java:41)
 at com.meterware.httpunit.HTMLPage.parse(HTMLPage.java:255)
 at com.meterware.httpunit.WebResponse.getReceivedPage(WebResponse.java:1109)
 at com.meterware.httpunit.WebResponse.getFrames(WebResponse.java:1098)
 at com.meterware.httpunit.WebResponse.getFrameRequests(WebResponse.java:875)
 at com.meterware.httpunit.FrameHolder.updateFrames(FrameHolder.java:179)
 at com.meterware.httpunit.WebWindow.updateFrameContents(WebWindow.java:252)
 at com.meterware.httpunit.WebClient.updateFrameContents(WebClient.java:485)
 at com.meterware.httpunit.WebWindow.updateWindow(WebWindow.java:146)
 at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:130)
 at com.meterware.httpunit.FrameHolder.updateFrames(FrameHolder.java:184)
 at com.meterware.httpunit.WebWindow.updateFrameContents(WebWindow.java:252)
 at com.meterware.httpunit.WebClient.updateFrameContents(WebClient.java:485)
 at com.meterware.httpunit.WebWindow.updateWindow(WebWindow.java:146)
 at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:130)
 at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:121)
 at com.meterware.httpunit.WebWindow.sendRequest(WebWindow.java:110)
 at com.meterware.httpunit.WebRequestSource.submitRequest(WebRequestSource.java:253)
 at com.meterware.httpunit.WebRequestSource.submitRequest(WebRequestSource.java:232)
 at com.meterware.httpunit.WebForm.submitRequest(WebForm.java:96)
 at com.meterware.httpunit.WebForm.doFormSubmit(WebForm.java:107)
 at com.meterware.httpunit.SubmitButton.doButtonAction(SubmitButton.java:67)
 at com.meterware.httpunit.Button.click(Button.java:81) 
   
   

 
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