"Unable to start debugging. The application uses a version of Silverlight that isn't supported by this debugger."

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 s开发者_如何学JAVAdk 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)

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I have same problems when trying to debug SL5 app. SL 5 Dev Runtime installation fixed the problem. Checkout http://www.silverlight.net/downloads for lastest downloadable version. In your case, you need to install additional Silverlight 4 Developer Runtime, you can find it here:

• SL 4 Dev Runtime
• SL 3 Dev Runtime