Error while retrieving body -- can not parse output parameters

While performing a Soap request, I am receiving the following error which is causing the replay to fail:

Action.c(9): Error:InvokeMethod failed: org.xml.sax.SAXException: wrong number of arguments
java.lang.IllegalArgumentException: wrong number of arguments
Action.c(9): Error:InvokeMethod failure: AXIS engine threw an exception.
Action.c(9): Error:Internal error, please call customer support. Details: Error while retrieving body -- can not parse output parameters
Action.c(9): Error:Web service call "GetAvailability_101" execution failed

The snapshot shows the request and response, and they are correct.  I do notice, however, that the response is not getting written to a parameter.

Any idea why it is erroring, even though the web service call is indeed succeeding?

Thanks,

Cody-