Fatal error: Uncaught Error: Using $this when not in object context in /usr/share/php/HTML/QuickForm.php:607 Stack trace: #0 /usr/share/php/HTML/QuickForm.php(573): HTML_QuickForm::_loadElement('createElement', 'radio', Array) #1 /var/www/iwont2014/registration.php(40): HTML_QuickForm::createElement('radio', 'lecture_radio', '', '', 'yes', Array) #2 {main} thrown in /usr/share/php/HTML/QuickForm.php on line 607