Data Services job not accessible as web service

Hi All,

I have published some of my data services 4.1 batch jobs as web service to an external applicaion.

But i get this message while trying to runn any job from the application:

while trying to invoke the method org.apache.axiom.om.OMElement.getText() of an object loaded from local variable 'cmsNode'

Any ideas on what is wrong here??