Google: This is not a valid URL. Please correct it and resubmit.

Hello @aid45

Thanks for following up here; the previous thread was closed because we didn’t hear from you again.

I see what you mean about the CSS errors! Do you have another plugin on that site for managing XML sitemaps apart from the Yoast SEO sitemap feature?

Hello again @aid45!

I assume the following lines are what you meant by The URL for the css in the first few lines is not correct:

<urlset xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:image="https://www.google.com/schemas/sitemap-image/1.1" xsi:schemaLocation="https://www.sitemaps.org/schemas/sitemap/0.9 https://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd https://www.google.com/schemas/sitemap-image/1.1 https://www.google.com/schemas/sitemap-image/1.1/sitemap-image.xsd" xmlns="https://www.sitemaps.org/schemas/sitemap/0.9">

It’s present for child sitemaps with images; you’ll see it’s not in the sitemap index source. They are for sitemap validation, and you can learn more here

Reviewing your screenshots, Google Search Console reports that Line 1 is showing as NULL. This could be due to a blank space or something getting loaded as Line 1 when Google tries to read the sitemap. Since the sitemap was last read 4th December, can you share a recent screenshot to show the current status of both child sitemaps reported as having the problem?

I look forward to hearing from you.

This thread was marked resolved due to a lack of activity, but you’re always welcome to re-open the topic. Please read this post before opening a new request.