SQLSTATE[23000]

J'ai fais un formulaire dans mon ArticleCrudController

<?php

namespace App\Controller\Admin;

use App\Entity\Article;
use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;
use EasyCorp\Bundle\EasyAdminBundle\Field\ImageField;
use EasyCorp\Bundle\EasyAdminBundle\Field\NumberField;
use EasyCorp\Bundle\EasyAdminBundle\Field\TextareaField;
use EasyCorp\Bundle\EasyAdminBundle\Field\TextField;
use Vich\UploaderBundle\Form\Type\VichImageType;

class ArticleCrudController extends AbstractCrudController
{
    public static function getEntityFqcn(): string
    {
        return Article::class;
    }

    public function configureFields(string $pageName): iterable
    {
        return [
            TextField::new('title'),
            TextareaField::new('content'),
            NumberField::new('price')->hideOnIndex(),
            TextField::new('imageFile')->setFormType(VichImageType::class)->onlyWhenCreating(),
            ImageField::new('file')->setBasePath('/uploads/articles/')->onlyOnIndex(),
        ];
    }
}

voici mon entité Article

namespace App\Entity;

use App\Repository\ArticleRepository;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Symfony\Component\HttpFoundation\File\UploadedFile;
use Vich\UploaderBundle\Mapping\Annotation as Vich;

/**
 * @ORM\Entity(repositoryClass=ArticleRepository::class)
 * @Vich\Uploadable
 */
class Article
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $title;

    /**
     * @ORM\Column(type="text", nullable=true)
     */
    private $content;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $image;

    /**
     * @Vich\UploadableField(mapping="article_images", fileNameProperty="image")
     * @var File
     */
    private $imageFile;

    /**
     * @ORM\Column(type="float")
     */
    private $price;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $file;

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getTitle(): ?string
    {
        return $this->title;
    }

    public function setTitle(string $title): self
    {
        $this->title = $title;

        return $this;
    }

    public function getContent(): ?string
    {
        return $this->content;
    }

    public function setContent(?string $content): self
    {
        $this->content = $content;

        return $this;
    }

    public function getImage(): ?string
    {
        return $this->image;
    }

    public function setImage(?string $image): self
    {
        $this->image = $image;

        return $this;
    }

    public function getPrice(): ?float
    {
        return $this->price;
    }

    public function setPrice(float $price): self
    {
        $this->price = $price;

        return $this;
    }

    public function __toString()
    {
        return $this->title;
        return $this->price;
    }

    public function getFile(): ?string
    {
        return $this->file;
    }

    public function setFile(string $file): self
    {
        $this->file = $file;

        return $this;
    }

    public function setImageFile(File $image = null)
    {
        $this->imageFile = $image;

        // VERY IMPORTANT:
        // It is required that at least one field changes if you are using Doctrine,
        // otherwise the event listeners won't be called and the file is lost
        // if ($image) {
        //     // if 'updatedAt' is not defined in your entity, use another property
        //     $this->updatedAt = new \DateTime('now');
        // }
    }

    public function getImageFile()
    {
        return $this->imageFile;
    }
}

voici l'erreur que j'obtient lorsque je rempli le formulaire de creation

An exception occurred while executing a query: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'file' cannot be null

si quelqun peut m'aider svp ?!!