Symfony fatal error

Symfony runs correctly but I get this error after I open in browser All my controller is empty Response

FatalThrowableError

Type error: Return value of Doctrine\Common\Annotations\AnnotationRegistry::registerLoader() must be an instance of Doctrine\Common\Annotations\void, none returned

Here is my config file, I use multiple database

# Doctrine Configuration
doctrine:
    dbal:
        default_connection: admin
        connections:
            admin:
                driver: pdo_mysql
                host: '%database_host%'
                port: '%database_port%'
                dbname: '%database_name%'
                user: '%database_user%'
                password: '%database_password%'
                charset: UTF8
            public_branch:
                driver: pdo_mysql
                host: '%database_host1%'
                port: '%database_port1%'
                dbname: '%database_name1%'
                user: '%database_user1%'
                password: '%database_password1%'
                charset: UTF8

    orm:
        auto_generate_proxy_classes: '%kernel.debug%'
        default_entity_manager: admin
        entity_managers:
            admin:
                connection: admin
                auto_mapping: true
            public_branch:
                connection: public_branch
                mappings:
                    AdminBundle: ~
                    PublicBranchBundle: ~

What can I do?