- << action.size() << " items were given on the line. First two should be process_id and action. " \
- << "This action needs after them " << mandatory << " mandatory arguments, and accepts " << optional \
+ << (action).size() << " items were given on the line. First two should be process_id and action. " \
+ << "This action needs after them " << (mandatory) << " mandatory arguments, and accepts " << (optional) \