Hello,
the same for me but only on one of the three sitemaps.
http://www.cantaussel.fr/post-sitemap.xml > OK
http://www.cantaussel.fr/page-sitemap.xml > OK
http://www.cantaussel.fr/features-sitemap.xml > 404 error
Even if I have 5 features online.
Cannot find the solution.
Please help.