did you create your entity using doctrine? I saw on your Job.php entity you are using annotation as mapping format.
In error output it said doctrine can't find any mapped entities. I've been there and it solved with specific configuration of your config.yml.
Try to change this on your config.yml
doctrine: dbal: driver: "%database_driver%" #etc orm: auto_generate_proxy_classes: "%kernel.debug%" auto_mapping: false mappings: MyAppMyBundle: type: annotation #On your case it should be annotation dir: Resources/Model/
Read this maybe it can help: