Why doesn't the service work in Symfony 4.2?

Question

symfony

Wrote a simple service for uploading files strictly according to this documentation https://symfony.com/doc/master/controller/upload_f... . However, Symfony throws an error

Cannot autowire service "App\Service\FileUploader": argument "$directory" of method "__construct()" has no type-hint, you should configure its value explicitly.

I understand that you need to specify the type, but what?

Answer 1

services:
    App\Service\FileUploader:
        bind:
            $directory: 'uploads/posts'

not arguments, but bind