Fatal error: Uncaught Error: Class "Phalcon\Validation\Validator\PresenceOf" not found in /var/www/samaeandira/apps/modules/app/forms/ContactForm.php:22 Stack trace: #0 [internal function]: SottiApp\Modules\App\Forms\ContactForm->initialize() #1 /var/www/samaeandira/apps/modules/app/controllers/ContatoController.php(18): Phalcon\Forms\Form->__construct() #2 [internal function]: SottiApp\Modules\App\Controllers\ContatoController->indexAction() #3 [internal function]: Phalcon\Dispatcher\AbstractDispatcher->callActionMethod() #4 [internal function]: Phalcon\Dispatcher\AbstractDispatcher->dispatch() #5 /var/www/samaeandira/public/index.php(46): Phalcon\Mvc\Application->handle() #6 {main} thrown in /var/www/samaeandira/apps/modules/app/forms/ContactForm.php on line 22