spring webservice and android

[racroi3010]

i have a spring webservice,but i can't call it from android app using ksoap2
private final String NAMESPACE = (targetNameSpace on spring webservice);
private final String URL = (locationUri);
private final String SOAP_ACTION = NAMESPACE+METHOD_NAME;
private final String METHOD_NAME = operation name;
it throw Exception ..START_TAG.. what wrong is there? thanks!