I have been playing with Silver 3 beta 1 and ran into a couple errors that really stumped me for a bit. Here is how you fix them in case any one else runs into them as well. 1- Object reference not set when adding a Silverlight WCF service: This is caused by your source control settings. I solved this issues by going to Tools –> Options –> Source Control and changing it from TFS to None. No idea why this causes the error but it did solve the issue for me. 2- Unable to find ‘DynamicTypeService’ error. This one was a little more work. In this folder C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE you will find a file called “Microsoft.VisualStudio.ServicesProxy.dll” this file needs to be removed (I just changed the extension to .old) before installing the Silverlight 3 beta 1 VS tools (which installs the SDK and the runtime). I of course had already installed all this so I uninstalled it all, renamed the file and installed it again (the installed with install the abo