I backed-up my site and now my views are broken My site recently got deleted by a possible hack. I backed up the database and the folders, but now my views are not working; everything else works. 

The fields are showing this in admin/build/views/edit/nameofview:


  Broken/missing handler: node_data_field_guru_photo > field_guru_photo_fid
      Broken/missing handler: node > title
      Broken/missing handler: views > nothing
      Broken/missing handler: node_revisions > body
      Broken/missing handler: node_data_field_guru_link > field_guru_link_url
It looks like it is looking for fields that do no longer exists?
Have you changed anything in your content types maybe?