Could not find deserializer

[Ravi Krishnamurthy]

Hello:
I have been playing with dynamic invocation client of webservices using 
Axis 1.2.1

In the call object, I call addRegisterTypeMapping. Interestingly, if the 
complex type is an output everything works fine. But if the complex type 
is an input, I get the exception below:

org.xml.sax.SAXException: Deserializing parameter 'mapds':  could not 
find deserializer for type {http://bizlogic.webservice.savvion.com}MapEntry

Would appreciate any pointers.

Thanks,
Ravi