What triggers this issue?
This issue is triggered when an invalid Sitemap format is used in Site Audit.
Why is it important?
A Sitemap helps point our crawlers to your most essential pages. Providing a valid format Sitemap also allows Site Audit to crawl your site efficiently.
How to fix it?
Site Audit has been optimized to process and analyze XML Sitemaps.
For a Sitemap to be considered valid, it must be presented in an XML format. Currently, Site Audit does not support any other Sitemap formats.