I backed up and moved my site and just got this error (everything else on the site works fine).
Fatal error: Call to undefined function mb_strlen() in /home/public_html/wp-content/plugins/iphorm-form-builder/includes/CSSParser/CSSParser.php on line 25
Can any help me with this please, i have updated the plugin and deactivated it and reactivated it again and still the same, I have checked permissions too.