olivia76310 on "[Plugin: XML Sitemap & Google News feeds] Error 500/503 when trying to open sitemap"

Hello,
Do you mean that ?
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="http://www.monweddingcamping.fr/wp-content/plugins/xml-sitemap-feed/includes/xsl/sitemap.xsl?ver=4.5.1"?>
<!-- generated-on="2016-02-04T08:30:20+00:00" -->
<!-- generator="XML & Google News Sitemap Feed plugin for WordPress" -->
<!-- generator-url="http://status301.net/wordpress-plugins/xml-sitemap-feed/" -->
<!-- generator-version="4.5.1" -->
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
Best regards,
Olivia