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Error an unhandled exception occurred in the Silverlight Application when creating SharePoint 2010 Sites

September 12, 2011 Leave a comment

When creating a new SharePoint 2010 site via the Silverlight interface, if you experience the Error, An unhandled exception occurred in the Silverlight Application there is a simple fix.

The problem is caused by the Silverlight application, attempting to communicate with the WCF endpoint using the Client Object Model when Security Validation is turned off for the web application.

To resolve, in Central Administration click on Manage Web Applications, highlight the problematic Web application and click General Settings from the ribbon.  Scroll down to Web Page Security Validation  and ensure Security Validation is On 

You will now be able to create sites using the Silverlight interface.

Categories: SharePoint, Silverlight
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