Hallo,

Google gives me when submitting a Sitemap constantly this error and I do not know how I can correct this:

"The namespace is not properly declared in the sitemap or the Sitemap index."

"Your Sitemap or Sitemap index file declares the namespace incorrectly.
Expected: http://www.sitemaps.org/schemas/sitemap/0.9
found: https://www.sitemaps.org/schemas/sitemap/0.9
Tag: urlset"

Our side runs under https: // and here is the link to the xml-Sitemap: https://www.lecura.de/index.php?option=com_jmap&view=sitemap&format=xml&lang=de

What settings do I need to fix the error?
Thank you already for Helping answers.