Hi,
Does this issue occur with the latest version of WordPress 5.5.1 and Yoast SEO for WordPress 15.1.1?
If you temporarily disable the Yoast SEO plugin, does this error message resolve? We’re trying to understand if this is related to the Yoast SEO plugin or if it could be caused by something else.
Just to be sure, we would like to rule out any plugin or theme conflicts that may occur. The fastest way to do this is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Nineteen.
Test this on your development or staging site, if you have one. If not, we recommend using the Health Check & Troubleshooting plugin. This plugin allows you to run a conflict check without affecting normal visitors to your site.
As we can imagine that you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process: How to check for plugin conflicts.
We are going ahead and marking this issue as resolved due to inactivity. If you require any further assistance please create a new issue.
