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SharePoint Designer can't open defaul.aspx page

Posted By:      Posted Date: September 02, 2010    Points: 0   Category :SharePoint
I tried to edit the default.aspx page of a WSS 3.0 site using SharePoint Designer and I get the following error:"The server could not complete your request.  Contact your Internet service provider or Web server administrator to make sure that the server has the FrontPage Server Extensions or SharePoint Service installed."When I click on the 'Details' button I get:"soaperverServer was unable to process request. ---> A Web Part or Web Form Control on this Web Part Page cannot be displayed or imported because it is not registered as safe on this site. You may not be able to open this page in an HTML editor that is compatible with Microsoft Windows SharePoint Services, such as Microsoft Office SharePoint Designer. To fix this page, contact the site administrator to have the Web Part or Web Form Control configured as safe. "I don't have any custom built Web Parts installed and I checked the web.config file to make sure that other parts are marked as safe.The weird thing is that I can successfully edit other default.aspx files on sub-sites  Thanks for any help

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