Fatal error: Uncaught Error: Call to undefined function imagecreatetruecolor() in /var/www/html/lib/plugins/captcha/helper.php:365
Stack trace:
#0 /var/www/html/lib/plugins/captcha/img.php(20): helper_plugin_captcha->_imageCAPTCHA('EXMWC')
#1 {main}
thrown in /var/www/html/lib/plugins/captcha/helper.php on line 365