creating a webservice on websphere integration developer

Hi! all, Iam trying to create a web service in websphere integration developer, of IBM,

While creating a wsdl file, it asks for literals, there we need to check the corresponding literal based upon the requiremnet.

I came to know that document literal is used for document inputs and outputs,where as rpc literal/rpc encoded is used when dealing with the primitive data types.

I created a simple addition operation with rpc encoded its working,
but i tried out with the rpc encoded , which is causing an error

the err is :

IWAB0135E An unexpected error has occurred.
SOAPException
Operation timed out: connect:could be due to invalid address

Iam not getting how to resolve this error,
Please let me know , if any has faced this kind of error , n know hows to solve.

And also let me know exactly , the difference between the literals.

Fine then,
Thanks & Regards,
D.Swetha.