Rss Feed not valide why

https://www.regnumchristi.fr/mjrwp/rss.xml
i have a view in a Drupal site that i want to show as an rss feed on a wordpress site. When entering the url for this feed into the plugins fill form i get the message that this is not a valid feed. Why ? it works as a feed when clicking on the link. thanks a lot Susanne

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