Fatal error: Uncaught Error: Class 'CFormElement' not found in /var/www/html/dev/sophia_frm_ext_lib/extensions/yiibooster/widgets/TbFormButtonElement.php:11 Stack trace: #0 {main} thrown in /var/www/html/dev/sophia_frm_ext_lib/extensions/yiibooster/widgets/TbFormButtonElement.php on line 11