端口报错截图：

heroku页面报错截图：

Google上的解决方法（也是全栈营同学写的）：

http://lihui-blog.logdown.com/posts/1694380

端口输入：

heroku run:detached rake db:migrate

（原因解释：here is the explanation for run:detached. Depending on the network, you might face connection problems between your pc and heroku. I don't really know the reason, but these procedures will restore that link. I face this problem a lot when I am in one specific network... – gabrielhilal）