Help about com.meterware.httpunit.Illegal ParameterValueException

Hi,
 
 There is a "select control" in my JSP as follows:
   <select name="color">
         <option value="red">Red</option>
      <option value="green">Green</option>
      <option value="blue">Blue</option>
      </select>   
 
    when I run a Test method, I get IllegalParameterValueException, why ?     
    public void testExecute1() throws Exception
    {
 WebConversation wc = new WebConversation();
 WebRequest request = new GetMethodWebRequest("<A href="http://127.0.0.1:8088/struts-cookbook-1.3.8/">http://127.0.0.1:8088/struts-cookbook-1.3.8/</A>");
 WebResponse response = wc.getResponse(request);
 WebLink link = response.getLinkWith("Execute");
 assertNotNull("superLink 'Execute' is null", link);
 
 WebResponse responseOfExecute = link.click();
 WebForm form = responseOfExecute.getFormWithID("simpleForm");
 assertNotNull("form 'simpleForm' is null", form);
        
    assertTrue("no parameter named 'color'", form.hasParameterNamed("color"));       
    form.setParameter("color", "green"); // throws IllegalParameterValueException
    }
 
 
Exception stack trace:
com.meterware.httpunit.IllegalParameterValueException: May not set parameter 'color' to 'blue'. Value must be one of: {  }
 at com.meterware.httpunit.SelectionFormControl$Options.reportNoMatches(FormControl.java:1186)
 at com.meterware.httpunit.SelectionFormControl$SingleSelectOptions.claimUniqueValues(FormControl.java:1360)
 at com.meterware.httpunit.SelectionFormControl$Options.claimUniqueValues(FormControl.java:1178)
 at com.meterware.httpunit.SelectionFormControl.claimUniqueValue(FormControl.java:1059)
 at com.meterware.httpunit.FormParameter.setValues(FormParameter.java:90)
 at com.meterware.httpunit.WebForm.setParameter(WebForm.java:612)
 at com.meterware.httpunit.WebForm.setParameter(WebForm.java:601)
 at com.struts.Test1.testExecute1(Test1.java:35)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at junit.framework.TestSuite.runTest(TestSuite.java:208)
 at junit.framework.TestSuite.run(TestSuite.java:203)
 
    Thanks a lot.

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