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popup error (unable to edit css) VS2010 .NET 4.0

Posted By:      Posted Date: September 13, 2010    Points: 0   Category :ASP.Net
Hi!I'm getting this strange error when i'm in SplitView or DesignView and i refresh view (i'm using VisualStudio 2010 .Net 4.0). This is happening only for this page and i have never seen anything like it, neither do i understand what is goin on.Any clues?

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