Missing template.... wsdl.rhtml

Hi,

   I am using SOAP4R to provide web services. When I dont mention
"expects" and "returns" parameter the wsdl file gets generated but as
soon as I specify the "expects" and "returns" parameter I get a template
missing error which looks something like this,

Missing template ...... wsdl.rhtml

Can anyone please explain me why is it searching for wsdl.rhtml and what
is the solution to this problem. Any information will be of great help.

Regards,
Pallavi