Thanks for the reply.
Unfortunately, I can’t test the “WP Meta SEO” sitemap because I’ve fixed a working sitemap in the meantime with another plugin. It contains all the pages and posts and I want to keep it. I uploaded it to google search and they are waiting for index now.
But I have one more question.
On January 13 and 14, I received an email from wordpress:
“WordPress has a built-in feature that can detect when any plugin or theme causes a serious error on your site and inform you via this email that is sent automatically.
In this case, WordPress has detected an error with one of your plugins, WP Meta SEO.”
I have not detected any error except sitemap.