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Hello,

We apologize for the issue you are facing with the sitemap when Rank Math is disabled. It sounds like there may be a conflict or a setting that needs to be adjusted.

To troubleshoot this, you can try the following steps:

1. Flush Permalinks: Go to WordPress Dashboard → Settings → Permalinks and click the Save Changes button without making any changes. This can help refresh your permalink structure.
   

2. Exclude Sitemap from Caching: Ensure that your sitemap is excluded from caching if you are using a caching plugin. You can refer to this dedicated knowledgebase article for guidance.

3. Disable Transient Caching: If the above solutions do not work, you can add a filter to your theme’s rank-math.php file to disable transient caching of your sitemap:

   /**
   * Filter if XML sitemap transient cache is enabled.
   *
   * @param boolean $unsigned Enable cache or not, defaults to true
   */
   add_filter( 'rank_math/sitemap/enable_caching', '__return_false');

If you continue to experience issues, please reply to this ticket with your site URL so that a human agent from our support team can assist you further. Thank you for raising this concern!

Sources:
Rank Math XML Sitemaps on NGINX Servers » Rank Math

Hello,

Thank you for contacting Rank Math support.

The most common reason for this error is a whitespace in your theme code, such as a blank line or space in your wp-config.php file or your theme’s functions.php file. This can happen when you edit these files manually or use a plugin or theme that modifies them.

To fix this error, you need to find and remove the whitespace from your theme code. You can refer to this guide: https://rankmath.com/kb/fix-sitemap-issues/#xml-text-declaration

If the issue persists, you can also use this script to automatically fix this error: https://wejn.org/stuff/wejnswpwhitespacefix.php.html

Looking forward to helping you.