Error-Could not load file or assembly 'System.Windows.Browser, Version=2.0.5.0, Culture=neutral, Pub...

Question

Hi,

I'm working with silverlight 4 and there is an error
"Could not load file or assembly 'System.Windows.Browser, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies. The system cannot find the file specified."

Can you give me a solution for me?