Warning: require_once(Zend/Validate/EmailAddress.php): failed to open stream: No such file or directory in /var/www/localhost/htdocs/php/database/users_class.php on line 438

Fatal error: require_once(): Failed opening required 'Zend/Validate/EmailAddress.php' (include_path='.:/usr/share/php7') in /var/www/localhost/htdocs/php/database/users_class.php on line 438