Could not find the manager name parameter in the container. Tried the following parameter names: "doctrine.default_entity_manager"

[wajaja]

Hi; I installed the bundle in symfony 4.2 but it does not work.

here are some details about the exception I'm getting:

by default after installing symfony; it's automatically configure orm and dbal; here is de default configuration for those bundle:

parameters:
    # Adds a fallback DATABASE_URL if the env var is not set.
    # This allows you to run cache:warmup even if your
    # environment variables are not available yet.
    # You should not need to change this value.
    env(DATABASE_URL): ''

doctrine:
    dbal:
        # configure these for your database server
        driver: 'pdo_mysql'
        server_version: '5.7'
        charset: utf8mb4
        default_table_options:
            charset: utf8mb4
            collate: utf8mb4_unicode_ci
    
        url: '%env(resolve:DATABASE_URL)%'
    orm:
        auto_generate_proxy_classes: true
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true
        mappings:
            App:
                is_bundle: false
                type: annotation
                dir: '%kernel.project_dir%/src/Entity'
                prefix: 'App\Entity'
                alias: App

then concerning odm; I followed all the instructions for his installation including:
- MongoDB & php-driver
- alcaeus/mongo-php-adapter
- doctrine/mongodb-odm-bundle, etc.

doctrine_mongodb.yaml:

auto_generate_proxy_classes: true
    auto_generate_hydrator_classes: true
    connections:
        default:
            server: '%env(resolve:MONGODB_URL)%'
            options: {}
    default_database: '%env(resolve:MONGODB_DB)%'
    document_managers:
        default:
            metadata_cache_driver:
                type: redis
                class: Doctrine\Common\Cache\RedisCache
                host: 127.0.0.1
                port: 6379
                instance_class: Redis
            auto_mapping: true
            mappings:
                AppUserBundle:
                    is_bundle: true
                    type: annotation
                    alias: User

fos_user:
    db_driver:       mongodb
    firewall_name:   api

when i try to login user i get the following exception and trace:
An exception occurred in driver: could not find driver which is caused in this trace

in vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php (line 106)
in vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php->convertException (line 169)
in vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php::wrapException (line 155)
in vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php::driverException (line 28)
in vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php->connect (line 356)
in vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php->connect (line 889) 
...

when i comment the code in doctrine.yml; I get this
Could not find the manager name parameter in the container. Tried the following parameter names: "doctrine.default_entity_manager"

So, what can i configure odm in symfony4

[malarzm]

The error seems to be self-explanatory: you need to install PDO or pdo_mysql as it's missing in your system

[etshy]

Make sure to install the mongo driver too (if not already installed), or you'll get the same kind of error with odm.