Fatal error: Uncaught exception 'Exception' with message 'Required GD library is missing' in /usr/local/apache2/htdocs/turnos/web/simple-php-captcha/simple-php-captcha.php:13 Stack trace: #0 {main} thrown in /usr/local/apache2/htdocs/turnos/web/simple-php-captcha/simple-php-captcha.php on line 13