I just pushed a commit to the repository which should fix this issue. See: https://github.com/nmpolo/Symfony2Rest/commit/d381b0a4652e76d5a4c1576d1afd8fa0e00eb0c1
This was being caused because the FOSRestBundle now requires you to implement ClassResourceInterface in your controllers to use implicit routing. See: https://github.com/FriendsOfSymfony/FOSRestBundle/blob/master/Resources/doc/5-automatic-route-generation_single-restful-controller.md#implicit-resource-name-definition