SAXException: SimpleDeserializer encountered a child element, which is NO

Hi all,
I'm using soapUI Pro 3.0.1. I have an issue. I can not run many test cases more than one times. Also I should extend the test steps by copy/paste in TextPad editor, sometimes they don't run. I create new test step and it works fine. Then I need to re-run this test step I get the following same error message;


 
     
        soapenv:Server.userException
        org.xml.sax.SAXException: SimpleDeserializer encountered a child element, which is NOT expected, in something it was trying to deserialize.
       
            trhtlangley5
       
     
 





But in free ex-version, this problem does not occur. Can you please help me? I need your help ASAP,

Thanks.
Pinar