我在命令上运行了heroku run rake db:migrate，但它仍然给了我这个错误。
任何人都可以对此有所了解吗？
这是我的heroku日志：
2014-07-29T02:11:15.351274+00:00 heroku[api]: Starting process with command `bundle exec rake db:migrate` by huicheese@
gmail.com
2014-07-29T02:11:19.242381+00:00 heroku[run.5786]: State changed from starting to up
2014-07-29T02:11:19.316545+00:00 heroku[run.5786]: Awaiting client
2014-07-29T02:11:19.361370+00:00 heroku[run.5786]: Starting process with command `bundle exec rake db:migrate`
2014-07-29T02:11:23.580801+00:00 heroku[run.5786]: Process exited with status 1
2014-07-29T02:11:23.594149+00:00 heroku[run.5786]: State changed from up to complete
2014-07-29T02:11:32.583627+00:00 heroku[api]: Starting process with command `bundle exec rake db:migrate` by huicheese@
gmail.com
2014-07-29T02:11:36.430861+00:00 heroku[run.3911]: State changed from starting to up
2014-07-29T02:11:36.313894+00:00 heroku[run.3911]: Starting process with command `bundle exec rake db:migrate`
2014-07-29T02:11:36.278413+00:00 heroku[run.3911]: Awaiting client
2014-07-29T02:11:40.389711+00:00 heroku[run.3911]: State changed from up to complete
2014-07-29T02:11:40.378758+00:00 heroku[run.3911]: Process exited with status 1
2014-07-29T02:21:27.602871+00:00 heroku[api]: Starting process with command `bundle exec rake db:migrate` by huicheese@
gmail.com
2014-07-29T02:21:31.169511+00:00 heroku[run.1298]: State changed from starting to up
2014-07-29T02:21:34.352865+00:00 heroku[run.1298]: State changed from up to complete
2014-07-29T02:21:30.975817+00:00 heroku[run.1298]: Awaiting client
2014-07-29T02:21:31.014523+00:00 heroku[run.1298]: Starting process with command `bundle exec rake db:migrate`
2014-07-29T02:21:34.344857+00:00 heroku[run.1298]: Process exited with status 1