poke @maxailloud

Unfortunately in my project we don't use the faker bundle command, we use directly the Factory::create().
Don't ask me why we use it like this, I didn't work on it, but we do.
I didn't try it yet but it might work for me as we don't use the command to generate our fake data, we just use the generator.

I have the same problem. Is faker compatible with symfony 4 ?

Services in Symfony 4 are no longer public by default. If you're looking for a quick and dirty fix, you can implement the process method from CompilerPassInterface into your src/Kernel.php and mark the faker.populator service as public.

class Kernel extends BaseKernel **implements CompilerPassInterface**

...

public function process(ContainerBuilder $container)
{
    $populator = $container->findDefinition('faker.populator');
    $populator->setPublic(true);
}