Thread:Extension talk:ConfirmEdit/PHP Fatal error: Class 'HTMLFormField' not found in /var/www/vhosts/.../httpdocs/extensions/ConfirmEdit/HTMLCaptchaField.php on line 22

While using

require_once( "$IP/extensions/ConfirmEdit/ConfirmEdit.php" ); require_once( "$IP/extensions/ConfirmEdit/ReCaptcha.php");

there is an error message is my severs error_log

PHP Fatal error: Class 'HTMLFormField' not found in /var/www/vhosts/berghapedia.nl/httpdocs/extensions/ConfirmEdit/HTMLCaptchaField.php on line 22

What is the problem?

Regards, GW