title: How to find missing web part?
body: <p>Does anybody know how to find offending web part which causes this error ?</p>
  
  <p>“A Web Part or Web Form Control on this Web Part Page cannot be displayed or imported because it is not registered on this site as safe.”</p>
  
  <p>I have inherited an old SharePoint 2003 portal site which uses custom web parts.</p>
  
  <p>I know what this error means. I also know that each web part must be installed and registred as safe in web.config. The problem is that I don't know which one is missing.
  I get same error when I'm trying to open the page in FrontPage as well.</p>