Unhandled exception occurred in Silverlight Applications in SharePoint 2010

"unhandled exception occurred in Silverlight Applications".This is error where we frequently get when we try to create any template selecting "more options" from site settings.This solution can be solved easily by going to Central Admin->Web Applications ->General Settings.Then your general settings web page security validation will be in on as below image,You just turn it to "off" else if it is "Off" turn it to "On"