无法找到Rails / Heroku的解决方案：“您正在寻找的页面不存在”

I signed up for the One Month Rails program a while back and am just now getting around to it. I've installed Rails, set up GitHub and Heroku. Everything seems to be working fine, the Rails test app runs on my local server, and I'm not getting any errors when pushing to Heroku but I keep getting "The page you were looking for doesn't exist."I signed up for the One Month Rails program a w