So right now I am looking at Silverlight for a number of clients and as always there is lots to learn here. Having just finished working on Silverlight 3 with my development envioronment working beautifully (see the Silverlight get started page) , I now need to help out on a v2 project.

I uninstalled the Silverlight 3 runtime and browsed to this client's site to see what actulally gets installed when a Silverlight 2 application is requested with no Silverlight runtime installed. Interestingly even though the client has a Silverlight 2 application, the Silverlight 3 runtime is installed via the Microsoft website. Anyhow, I digress.

On now trying to debug the solution (which has been upgraded to a Silverlight 3 project - see Tim's Heur's blog for more info on having v2/3 on the same machine) and after installing the Silverlight 3 runtime again I get the following error in Visual Studio:

There are quite a few posts on the web about this issue with the a beta verion of Silverlight 2, but of course this does not help.

Solution:

Close Visual Studio, uninstall Microsoft® Silverlight™ 3 Tools for Visual Studio 2008 SP1.

 and then reinstall. Hope this helps.

What is in the Silverlight Tools for Visual Studio?