Fatal errror!

Fatal error: Uncaught Error: Call to undefined function mcrypt_get_iv_size() in /var/www/html/wp-content/plugins/sendgrid-email-delivery-simplified/lib/class-sendgrid-tools.php:431 Stack trace: #0 /var/www/html/wp-content/plugins/sendgrid-email-delivery-simplified/lib/class-sendgrid-tools.php(229): Sendgrid_Tools::encrypt(‘xxxxxxxx’, ‘xxxxxxxx’) #1 /var/www/html/wp-content/plugins/sendgrid-email-delivery-simplified/lib/class-sendgrid-statistics.php(74): Sendgrid_Tools::get_password() #2 /var/www/html/wp-includes/plugin.php(525): Sendgrid_Statistics::add_statistics_menu(”) #3 /var/www/html/wp-admin/includes/menu.php(149): do_action(‘admin_menu’, ”) #4 /var/www/html/wp-admin/menu.php(279): require_once(‘/var/www/html/w…’) #5 /var/www/html/wp-admin/admin.php(138): require(‘/var/www/html/w…’) #6 /var/www/html/wp-admin/plugins.php(10): require_once(‘/var/www/html/w…’) #7 {main} thrown in /var/www/html/wp-content/plugins/sendgrid-email-delivery-simplified/lib/class-sendgrid-tools.php on line 431

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