An unhandled exception occurred in the Silverlight Application

I was getting "An unhandled exception occurred in the Silverlight Application" when I tried to create a new site in my new SharePoint 2010 farm. I was unable to create even the most basic blank site.

Thanks to Simon Carpentier at SharePoint Overflow, I was able to resolve this issue.

To resolve the issue, you need to go to Central Administration/Application management/(Select the web application)/General Settings/Set Web page Security Validation to "On"