It might be a possible conflict with one of your other plugin or theme; you can try to install and activate WP Safe Mode to virtually confirm this without having to deactivate other plugin or theme.
https://wordpress.org/plugins/wp-safe-mode/
I spent all day trying to get that plugin to work, deleted it and deactivated plugins one by one until I found the plugin causing the issue. It was Yoast Version 14.4.1. When deactivated, your plugin works. Now what? I need to keep Yoast.
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This reply was modified 6 years ago by
pgilpat.
I seem to be stuck in never never land. My error was different than the one discussed by Marcus here https://github.com/Yoast/wordpress-seo/issues/15072, but my problem was associated with this one and closed. I’m still getting this error. Can someone please help?