Command perso sur symfony 3.4 non reconnue

<?php
namespace AppBundle\Command;

use Doctrine\DBAL\Exception\DriverException;
use Exception;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Output\StreamOutput;
use UnexpectedValueException;

class UpCommand extends Command {
    protected function configure() {
        $this
        // Nom de la commande
        ->setName('my:schemas:update')

        // Description de la commande
        ->setDescription('Description ')
        ->setHelp('Cette commande permet de mettre à jour les schemas en masse')
        ->setDefinition(
            new InputDefinition(array(
                new InputOption('agence', 'a', InputOption::VALUE_REQUIRED, 'Code agence sur 3 caractères')
            )
    ));
    }

    protected function execute(InputInterface $input, OutputInterface $output) {
      
        $output->writeln("schemas public modifié");                             
        exit;

    }
        
}    

php bin/console my:schema:update --agence=111

 [WARNING] Some commands could not be registered:
  Cannot add a required argument after an optional one.

  There are no commands defined in the "my:schema" namespace.

  Did you mean this?
      doctrine:schema

AppBundle\Command\UpCommand:
    tags:
        - { name: 'console.command', command: 'my:schemas:update' }