It seems that your WSDL is not well defined, you need to test your wsdl via WS-I compliance in order to check if the wsdl is well created, you can do this via soapui, just create a new project, import the wsdl file or set the URL, left click in the project and select check WS-I compliance, this tool will test your wsdl and gives you a detailed report of what might be the problem.
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