This could mean you have an emacs that was not compiled with libxml.
Type C-h v system-configuration-options
and look for --with-xml2
to see if your emacs was built with it.
John
-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803