Thanks for replying but — I did check, and the “sitemap.php” file exists in the uploaded theme. Moreover, as I mentioned in my post, the error is *irregular* — intermittent. Time #1, I go to click the Sitemap link, and it works. Time #2, it fails to load with the 2 err0r messages stated above. Same messages, whenever that happens.
Here is a screenshot showing the sitemap working:
https://www.orebody.com/ice/press/wp-content/themes/tiny/error.pdf
Here is a screenshot showing the sitemap NOT working:
https://www.orebody.com/ice/press/wp-content/themes/tiny/no-error.pdf
Any other thoughts? Any help would be much appreciated!