My site works perfectly locally. When I upload it to the server, I get the following error: I only get the error on the page that tries to use the SqlServer CE database. If you wish, you can compare it to one that is working: Broken: http://jeffreygetzin.com/Pages/CircusReviews.aspx Working: http://jeffreygetzin.com/Pages/Reviews.aspx The CircusReviews page has an EntityDataSource. How do I get this working? Thanks, Jeff P.S. It seems I can only go as high as .NET 4.0 on your site, yet your web page says I can get up to 4.5.x. Is there some kind of change I need to make to get access to the higher versions of .NET?