Sitemap error: error on line 2 at column 84: Extra content at the end of the doc

I have the same problem. How to fix it.

I have the same problem.
“This page contains the following errors:
error on line 2 at column 84: Extra content at the end of the document
Below is a rendering of the page up to the first error.”
How to fix it.?

I figured out what seemed to be the problem.

There were no pages published since it was still a fresh wp installation. After I published the first page the error was gone

This page contains the following errors:
error on line 2 at column 84: Extra content at the end of the document
Below is a rendering of the page up to the first error.

I’m getting a lot of these PHP warnings in the logs:

PHP Warning file_get_contents(/nas/content/live/xxxxxxx1/wp-content/uploads/rank-math/rank_math_db75f2bac996b279b973d046aa2fe245.xml): failed to open stream: No such file or directory 
    [internal] file_get_contents
    /nas/content/live/xxxxxxx1/wp-admin/includes/class-wp-filesystem-direct.php:39 WP_Filesystem_Direct::get_contents
    /nas/content/live/xxxxxxx1/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-cache.php:98 RankMath\Sitemap\Cache::get_sitemap
    /nas/content/live/xxxxxxx1/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php:131 RankMath\Sitemap\Sitemap_XML::has_sitemap_in_cache
    /nas/content/live/xxxxxxx1/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php:85 RankMath\Sitemap\Sitemap_XML::output
    /nas/content/live/xxxxxxx1/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-sitemap-xml.php:75 RankMath\Sitemap\Sitemap_XML::__construct
    /nas/content/live/xxxxxxx1/wp-content/plugins/seo-by-rank-math/includes/modules/sitemap/class-router.php:78 RankMath\Sitemap\Router::request_sitemap
    /nas/content/live/xxxxxxx1/wp-includes/class-wp-hook.php:287 WP_Hook::apply_filters
    /nas/content/live/xxxxxxx1/wp-includes/class-wp-hook.php:311 WP_Hook::do_action
    /nas/content/live/xxxxxxx1/wp-includes/plugin.php:544 do_action_ref_array
    /nas/content/live/xxxxxxx1/wp-includes/class-wp-query.php:1080 WP_Query::parse_query
    /nas/content/live/xxxxxxx1/wp-includes/class-wp-query.php:1766 WP_Query::get_posts
    /nas/content/live/xxxxxxx1/wp-includes/class-wp-query.php:3448 WP_Query::query
    /nas/content/live/xxxxxxx1/wp-includes/class-wp.php:624 WP::query_posts
    /nas/content/live/xxxxxxx1/wp-includes/class-wp.php:747 WP::main
    /nas/content/live/xxxxxxx1/wp-includes/functions.php:1285 wp
    /nas/content/live/xxxxxxx1/wp-blog-header.php:16 require
    /nas/content/live/xxxxxxx1/index.php:17 [main]

i have this error too