Symfony 2.7: Could not load type "Symfony\Component\Form\Extension\Core\Type\TextType"

Question

I am working on an application based on Symfony 2.7. I have a custom form type containing the following code:

namespace MyCompany\AppBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Validator\Constraints\NotBlank;

class ContactType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class,
                [
                    'attr'=>
                        [
                            'placeholder' => 'Your name'
                        ],
                    'constraints' =>
                        [
                            new NotBlank(['message' => 'Please provide your name'])
                        ]
                ]
            )
        ;
    }
...

... and when I load the form, I get the following InvalidArgumentException:

Could not load type "Symfony\Component\Form\Extension\Core\Type\TextType"

I have verified that the TextType class exists.

I tried using composer dump, and it didn't seem to help. In addition, I tried removing the vendor directory and redoing composer install, and that didn't help either.

What else can I try?

You can run composer dump in order to refresh the vendors cache, or remove the vendor/ directory like someone did. — A.L
– A.L, Commented Sep 26, 2018 at 9:26
Thanks for your comment, AL. I just tried using composer dump, and it didn't seem to help. I also just tried removing the vendor directory and redoing composer install, and that didn't help either. — Mayor of the Plattenbaus
– Mayor of the Plattenbaus, Commented Sep 26, 2018 at 9:39

Andy · Accepted Answer · 2018-09-26 14:31:22Z

You can't use fully qualified class names to denote form types in Symfony v2.7 - that was added in v2.8. You need to denote your types by passing an instance instead:

$builder
    ->add('name', new TextType(),
        [
            'attr'        =>
                [
                    'placeholder' => 'Your name',
                ],
            'constraints' =>
                [
                    new NotBlank(['message' => 'Please provide your name']),
                ],
        ]
    );

Or by using the shorthand name e.g text:

$builder
    ->add('name', 'text',
        [
            'attr'        =>
                [
                    'placeholder' => 'Your name',
                ],
            'constraints' =>
                [
                    new NotBlank(['message' => 'Please provide your name']),
                ],
        ]
    );

Symfony v2.7 isn't maintained anymore though, so I'd highly recommend upgrading to at least v2.8

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