throw an error if elements fail to link.
throw an error if elements fail to link.

svn path=/trunk/; revision=400

GNOME/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,jku/rygel,GNOME/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,luisbg/rygel