Error in Risk Analyzer of Access Enforcer

We are getting the below error in Risk analyzer of access enforcer in the GRC system that we have

Risk analysis failed: Exception in getting the results from the web service : Service call exception; nested exception is: com.sap.engine.services.webservices.jaxrpc.exceptions.XmlUnmarshalException: XML Deserialization Error. Invalid parser state. This exception is caused when deserializing XML type [http://www.w3.org/2001/XMLSchema] and wrong XML node is found.

The version of the system is AE 5.2 SP11 (Build-59112)

could come one help on this?

Regards

Bharathwaj V