The file does not contain valid YAML?

Question

YAML

https://symfony.com/doc/current/controller/argumen...

# Put parameters here that don't need to change on each machine where the app is deployed
# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
parameters:
    locale: 'en'

services:
    # default configuration for services in *this* file
    _defaults:
        autowire: true      # Automatically injects dependencies in your services.
        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
        public: false       # Allows optimizing the container by removing unused services; this also means
                            # fetching services directly from the container via $container->get() won't work.
                            # The best practice is to be explicit about your dependencies anyway.

    # makes classes in src/ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    App\:
        resource: '../src/*'
        exclude: '../src/{Application,Domain,Infrastructure}'

    # controllers are imported separately to make sure services can be injected
    # as action arguments even if you don't extend any base controller class
    App\Application\Controller\:
        resource: '../src/Application/Controller'
        tags: ['controller.service_arguments']

    # add more service definitions when explicit configuration is needed
    # please note that last definitions always *replace* previous ones

    App\Infrastructure\Validator\Resolver:
       tags:
           - { name: controller.argument_value_resolver, priority: 50 }

The error knocks out if you add lines from the docks.
Can you please tell me why it says invalid?

Answer 1

valid. most likely a mess in the indentation (space / tab).