我在SearchType.php文件中创建了一个表单类型。但是当我试图在search.html.twig文件中显示表单时，没有任何输入被显示。我试图在html.twig文件中写入{{ form（form）}}并查看我所拥有的内容。我发现自己的文本输入是空的，而不是预期的两个选择。
如何显示在我的表单类型中创建的输入？
SearchType.php

<?php

namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;

class SearchType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('bigcity', ChoiceType::class, [
                'choices' => [
                    'Je sélectionne une ville' => '',
                    'Paris, France' => 'paris'
                ]
            ])
            ->add('category', ChoiceType::class, [
                'choices' => [
                    "Je sélectionne un type d'activité" => '',
                    'Eat Zpeak !' => 'eatzpeak',
                    'Party Zpeak !' => 'partyzpeak',
                    'Run Zpeak !' => 'runzpeak',
                    'Art Zpeak !' => 'artzpeak',
                ]
            ])
            ->add('save', SubmitType::class)
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => null
        ]);
    }
}

search.html.twig

{% extends 'base.html.twig' %}

{% block title %}Liste des sorties et des activités !{% endblock %}

{% block main %}

<div class="position-relative">

    <div class="position-absolute top-50 start-50 translate-middle">
        {{ form_start(form) }}
            {{ form_widget(form.bigcity) }}
            {{ form_widget(form.category) }}
        {{ form_end(form) }}
    </div>

</div>

{% endblock %}

我有这个错误：

Neither the property "bigcity" nor one of the methods exist and have public access in class

EventsController.php

<?php

namespace App\Controller;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\Form\Extension\Core\Type\SearchType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class EventsController extends AbstractController
{   
    #[Route('/search', name: 'search')]
    public function search(Request $request)
    {   
        $form = $this->createForm(SearchType::class);
        return $this->render('front/search.html.twig', [
            'form' => $form->createView()
        ]);
    }
}