I see a?critical error message when I select any of the free courses. I did turn on WordPress debugging tool from the host site and when I select the course this message error message pop up.
Notice: Function WP_Scripts::localize was called incorrectly. The $l10n parameter must be an array. To pass arbitrary data to scripts, use the wp_add_inline_script() function instead. Please see Debugging in WordPress for more information. (This message was added in version 5.7.0.) in /www/daytraderworld_440/public/wp-includes/functions.php on line 5835
I deactivate all the plugins and turn them one at a time. I check the active theme and could not find the error in the functions.php