SharePoint 2010 Error: "Unexpected error in Silverlight Application"


Some of you  might have come across the error “Unexpected error in Silverlight Application” while trying to create new sites or lists in SharePoint 2010 especially with newly created web applications. Here is a simple fix.

  1. Navigate to Central Admin > Application Management > Manage Web Applications.
  2. Select the web application having the issue and click General Settings on the ribbon.
  3. Change Web Page Security Validation from Off to On. Click OK to close the window.
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6 thoughts on “SharePoint 2010 Error: "Unexpected error in Silverlight Application"

  1. Hi Saji,
    first, thank you very much! you made me save a lot of time.
    What bothers me however is not to understand the reason why this operation is necessary

    thanks again

    Marco

  2. I haven’t found an explanation on why it’s happening yet. Recently, one of my web applications started showing this error and the Security Validation was already set to “on”. Toggling it couple of times resolved the issue. Strange!!!

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