服务文件错误，添加标签和别名时可以使用 isdoi名称

You have wrong service file, when You add tags and alias you could use "isdoi" name

merrin.main.validator.isdoi:
    class:  Merrin\MainBundle\Validator\Constraints\IsDOIValidator
    arguments: 
        entityManager: "@doctrine.orm.entity_manager"
    tags:
        - { name: validator.constraint_validator, alias: isdoi }