Steve

Problem:
Message :
There is a problem with the String Translation table in your site. This problem is not causing a problem running the site right now, but can become a critical issue in the future. WPML support team knows how to fix it. Please add a message in the relevant support thread and we'll fix it for you.

Solution:
We've found some edge cases where this error is fixed following these instructions to recreate icl_tables:

- Make a full backup of your site (files and database)
- Please add this code to the bottom of the functions.php file in your theme's root folder

function wpml_fix_missing_icl_tables() {
   
    if( function_exists( 'icl_sitepress_activate' ) )
   
        icl_sitepress_activate();
   
}
   
add_action( 'wp_footer', 'wpml_fix_missing_icl_tables' );

- Visit your site's homepage at least one time
- Remove the code

Once you complete these steps, then you have to remove the keys "wpml_string_table_ok_for_mo_import" and "wpml_notices" from the options table (by default wp_options, where "wp_" is your database prefix), and all errors should be gone.

Relevant Documentation:
https://wpml.org/errata/missing-_icl_strings-_icl_string_translations-data-tables/