“SearchAction” object cannot be nested inside a “WebSite” object

Another user reported this warning so it’s not something we’ve seen before. Without more information about the error, I can only guess as to the cause.

Is the error specific to a certain URL or does it happen for your entire site?
Have you customized the schema output?
Do any plugins you use integrate with Yoast schema?
Does Google Search Console provide more information (like a link to learn more) about this error?

That said, you or your developer can use the disable_wpseo_json_ld_search filter and return true to disable the search site links schema.

add_filter('disable_wpseo_json_ld_search', '__return_true');

Typically code snippets are added to your theme’s functions.php file. If you’re not familiar with using code snippets, these articles have wonderful advice:
https://www.wpbeginner.com/plugins/how-to-easily-add-custom-code-in-wordpress-without-breaking-your-site/
https://www.wpbeginner.com/beginners-guide/beginners-guide-to-pasting-snippets-from-the-web-into-wordpress/

Closed due to inactivity.