OldSoundRabbitMqExtension.php line 677: Class %old_sound_rabbit_mq.producer.class% does not exist

old_sound_rabbit_mq:
connections:
    default:
        host:     'localhost'
        port:     5672
        user:     'user'
        password: 'pass'
        vhost:    '/'
        lazy:     false
        connection_timeout: 3
        read_write_timeout: 3
        # requires php-amqplib v2.4.1+ and PHP5.4+
        keepalive: false
        # requires php-amqplib v2.4.1+
        heartbeat: 0
        #requires php_sockets.dll
        use_socket: true # default false
    another:
        # A different (unused) connection defined by an URL. One can omit all parts,
        # except the scheme (amqp:). If both segment in the URL and a key value (see above)
        # are given the value from the URL takes precedence.
        # See https://www.rabbitmq.com/uri-spec.html on how to encode values.
        url: 'amqp://guest:password@localhost:5672/vhost?lazy=1&connection_timeout=6'
producers:
    upload_picture: #this are ignored by the moment, only want the consumers
        connection:            default
        exchange_options:      {name: 'upload-picture', type: direct}
        service_alias:         TestService # no alias by default
        default_routing_key:   'optional.routing.key' # defaults to '' if not set
        default_content_type:  'content/type' # defaults to 'text/plain'
        default_delivery_mode: 2 # optional. 1 means non-persistent, 2 means persistent. Defaults to "2".
consumers: #here my consumers, that i really need
    activty_log:
        connection:       default
        exchange_options: {name: 'la.1.activity.activity_to_save', type: direct}
        queue_options:    {name: 'la.1.activity.activity_to_save'}
        callback:         TestService #activity_log_service

    <?php
// src/Service/MessageGenerator.php
namespace App\Service;
class TestService
{
    public function __construct(
		$entityManager,
		$producer
    ) {
		dd("hi constructor", $entityManager, $producer);
    }
    // ...
	public function testFunct(){
		dump("hello dummy!");
	}
	/*public function getConnectionParameters() {
        return array('vhost' => $this->getVhost());
    }*/
}