For Vich Uploader

you need to use implements and public function serializable/unserializable.

​

  class NameEntity implements Serializable

{

  //code here 

  public function serialize()

    {

        return serialize($this->getId());

    }

​

    public function unserialize($serialized)

    {

        $this->id = unserialize($serialized);

    }

}

​

It works for me.

For Vich Uploader,

you need to use implements Serialize

​

  use Serializable;

​

  Class EntityName implements Serialize

{

  //code here

      public function serialize()

    {

        return serialize($this->getId());

    }

​

    public function unserialize($serialized)

    {

        $this->id = unserialize($serialized);

    }

}

​

It works for me.