我无法将Play 2.2.1应用程序部署到heroku。这就是我所看到的：
Delta compression using up to 4 threads.
Compressing objects: 100% (1056/1056), done.
Writing objects: 100% (1163/1163), 271.55 KiB | 136 KiB/s, done.
Total 1163 (delta 565), reused 0 (delta 0)
-----> Removing .DS_Store files
-----> Fetching custom git buildpack... done
! Push rejected, no Cedar-supported app detected
To git@heroku.com:pacific-chamber-5618.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'git@heroku.com:pacific-chamber-5618.git
为什么会失败的原因？