As2 Adapter Parser error

Hi

I am trying to send data from Rfc to As2 .In the As2 adapter i am getting the below error while

parsing

MP: exception caught with cause com.sap.aii.converter.x12.xml2x12.XML2X12Exception: XML-Parser error occured while parsing: Cannot process close tag S_GS: while trying to invoke the method java.lang.String.trim() of a null object loaded from field com.sap.aii.converter.x12.xml2x12.handler.XML2X12Handler.interchangeSender of an object loaded from local variable 'this'

Error

Exception caught by adapter framework: XML-Parser error occured while parsing: Cannot process close tag S_GS: while trying to invoke the method java.lang.String.trim() of a null object loaded from field com.sap.aii.converter.x12.xml2x12.handler.XML2X12Handler.interchangeSender of an object loaded from local variable 'this'

Error

Transmitting the message to endpoint <local> using connection RFC_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.aii.converter.x12.xml2x12.XML2X12Exception: XML-Parser error occured while parsing: Cannot process close tag S_GS: while trying to invoke the method java.lang.String.trim() of a null object loaded from field com.sap.aii.converter.x12.xml2x12.handler.XML2X12Handler.interchangeSender of an object loaded from local variable 'this'

I have attached the screen shot of the mapping the module i have used

Thanks

Jai