Heroku dyno / worker在开始时崩溃

我有一个用Rails编写的应用程序，部署在Heroku上 . 我曾经在一个网络dyno上工作，但今天我发布了应用程序，流量非常大，所以我决定增加到4个网络dynos和1个工作人员dynos . 我不知道为什么总是当我做 heroku ps 它显示：

Process   State           Command                            
--------  --------------  ---------------------------------  
web.1     up for 22s      bundle exec rails server -p $PORT  
web.2     up for 36s      bundle exec rails server -p $PORT  
web.3     up for 25s      bundle exec rails server -p $PORT  
web.4     up for 22s      bundle exec rails server -p $PORT  
worker.1  crashed for 7s  bundle exec rake jobs:work

Worker dyno在 heroku scale worker=1 之后直接崩溃 . 日志就像：

2012-03-11T23:12:18+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work`
2012-03-11T23:12:19+00:00 heroku[worker.1]: State changed from starting to up
2012-03-11T23:12:22+00:00 app[worker.1]: rake aborted!
2012-03-11T23:12:22+00:00 app[worker.1]: Don't know how to build task 'jobs:work'
2012-03-11T23:12:22+00:00 app[worker.1]: 
2012-03-11T23:12:22+00:00 app[worker.1]: (See full trace by running task with --trace)
2012-03-11T23:12:23+00:00 heroku[worker.1]: Process exited with status 1
2012-03-11T23:12:23+00:00 heroku[worker.1]: State changed from up to crashed
2012-03-11T23:12:23+00:00 heroku[worker.1]: State changed from crashed to created
2012-03-11T23:12:23+00:00 heroku[worker.1]: State changed from created to starting
2012-03-11T23:12:32+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work`
2012-03-11T23:12:32+00:00 heroku[worker.1]: State changed from starting to up
2012-03-11T23:12:36+00:00 app[worker.1]: rake aborted!
2012-03-11T23:12:36+00:00 app[worker.1]: Don't know how to build task 'jobs:work'
2012-03-11T23:12:36+00:00 app[worker.1]: 
2012-03-11T23:12:36+00:00 app[worker.1]: (See full trace by running task with --trace)
2012-03-11T23:12:37+00:00 heroku[worker.1]: Process exited with status 1
2012-03-11T23:12:37+00:00 heroku[worker.1]: State changed from up to crashed

而已 . 你知道为什么吗？ Web dynos工作正常 . 我是否必须在我的应用程序中配置某些内容以使用工作人员dynos？

如果你能用人类的话来解释我将heroku平台划分为网络和工作人员dynos的逻辑，我将不胜感激？我已经阅读了文档次数，但我仍然认为我错过了理解它的观点，因为我在你有存储限制和东西的世界里长大 .