I seem to be having issues with the call web service action. I am calling a Lotus Notes web service and logging errors. I am receiving the following error: "Value cannot be null. Parameter name: requestUriString". The strange thing is that there is no input parameter in my web service by that name. Another member of my team has built a quick .Net solution to call the web service and has been successful in doing so while providing the same input parameters as me. To rule out a firewall issue on my server I built a .exe from the .Net solution and was able to successfully run it from my SharePoint server. Any ideas?? Thanks!