An unhandled exception occurred in the silverlight application sharepoint 2010

An unhandled exception occurred on the page when I Try to create a List in SP 2010 site or any other Object.


Solution :

1. You need to browse to your web application overview page: Application Management --> Manage web applications.

2. Select the web application you'd like to change the settings of.

3. Click General Settings in the ribbon.

4. Half way the Web Application General Settings dialog, you'll find the Web Page Security Validation section. Turn the Security validation On.