Getting admin-ajax 500 error while using LOAD MORE button in only one site.

Replies: 0

The plugin works fine in all other sites where I am using it. But in one site hosted in DigitalOcean droplet – the Loadmore button is not working. It is stuck and showing Loading…, in console I am getting ajax-admin error 500.

Here’s the wp-debug log –

[01-May-2021 06:12:01 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function mb_convert_encoding() in /var/www/html/wp-content/plugins/ele-custom-skin/includes/ajax-pagination.php:445
Stack trace:
#0 /var/www/html/wp-content/plugins/ele-custom-skin/includes/ajax-pagination.php(433): ECS_Ajax_Load->clean_response()
#1 /var/www/html/wp-includes/class-wp-hook.php(287): ECS_Ajax_Load->get_document_data()
#2 /var/www/html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters()
#3 /var/www/html/wp-includes/plugin.php(484): WP_Hook->do_action()
#4 /var/www/html/wp-admin/admin-ajax.php(184): do_action()
#5 {main}
  thrown in /var/www/html/wp-content/plugins/ele-custom-skin/includes/ajax-pagination.php on line 445

Can you please help on how to solve this?