[تم الحل] I get this error when ever I try to translate something

Background of the issue:
I am trying to translate my footer using WPML. I encountered an error during this process.

Symptoms:
Fatal error: Uncaught Error: Call to undefined function mb_ereg_replace_callback() in /home/yogafitoxy/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/xliff/class-wpml-tm-validate-html.php:124. There has been a critical error on this website.

Questions: