i see this error too.
for me, the root cause is theme and plugins use package “WordPress Helpers” but different version. my theme use “1.0.3” but this plugin use “1.1.18”. and wordpress load “WordPress Helpers” from theme folder before plugin, so some feature in newer version dose not exists.
for me i fix this by replace /wp-content/themes/**THMEM_FOLDER**/vendor/mythemeshop with wp-content/plugins/seo-by-rank-math/vendor/mythemeshop. it should work because if they use sematic version, it will never break change if major version not update.
