Symfony bug with forms

I am experiencing the following form error in Symfony:

Neither the property "email" nor one of the methods "email()", "getemail()"/"isemail()"/"hasemail()" or "__call()" exist and have public access in class "Symfony\Component\Form\FormView".

This is what my form looks like:

My App\Form\LostPasswordType:

namespace App\Form;
use Symfony\Component\Form\Extension\Core\Type\EmailType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use App\Entity\LostPassword;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\AbstractType;

class LostPasswordType extends AbstractType
{
    public function builder(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->setAction('/forgotpw')
            ->setMethod('POST')
            ->add('mail', EmailType::class, [
                'required' => true,
                'label'    => false,
                'attr'     => [
                    'autofocus' => false,
                    'class' => 'span8',
                    'placeholder' => '[email protected]'
                ]
            ])
            ->add('submit', SubmitType::class, [
                'label' => 'Reset Password',
                'attr' => ['class' => 'btn btn-primary btn-green']
            ])
        ;
    }

    public function configureOption(OptionsResolver $resolver)
    {
        $resolver->setDefaults(['data_class' => LostPassword::class]);
    }
}

And this is my controller code:

$formReset = $this->createForm(
    LostPasswordType::class,
    $forgotpass,
    array('csrf_protection' => false)
);
$formReset->handleRequest($request);

Does anyone know why I am receiving this error?