title: "Unable to start debugging. The application uses a version of Silverlight that isn't supported by this debugger."
body: <p>Im using VS 2010 to make silverlight application using silverlight 4.0
  Debugger and everything worked fine until 3 days ago when this message sudenly showed up. It shows every time I try to run my silverlight application. I tried reinstalling siverlight 4 sdk it didn't helped.
  What can I do? Internets search gives nothing.
  (btw I tried installing VS2010 SP1 after message start showing, it also didnt helped)</p>