Last modified: 2014-08-07 15:49:54 UTC
Parsoid reports lack of the <references/> tag: http://parsoid.wmflabs.org/frwikisource/Le%20M%C3%A9canisme%20de%20la%20Vie%20moderne/11 But the tag is here: http://fr.wikisource.org/w/index.php?title=Le_M%C3%A9canisme_de_la_Vie_moderne/11&action=edit
The source actually shows an empty <ol></ol> that shows that we saw a references tag. The error message seems to be added by the PHP parser, possibly in an extension call.
The page referred to does not report any errors now, so closing it until another is found.