I've never seen this error before but it points to a web service connection script or WSDL that is invalid. When exactly does this error occur? You mentioned Email Configuration but I'm not sure how a web service script ties into that. I suppose it's possible this is being thrown if the connection to an EWS endpoint is having some sort of trouble as EWS has an inherent Web Service under the hood.
This actually was a problem outside of Ivanti. The password for our email server was not being managed. It is working.