I tried deploying the app to Dokku and it failed to select a buildpack.

[sanket-nainani]

Counting objects: 4, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 344.46 KiB | 6.15 MiB/s, done.
Total 4 (delta 0), reused 0 (delta 0)
-----> Cleaning up...
-----> Building isomorphic-react from herokuish...
-----> Adding BUILD_ENV to build environment...
-----> Unable to select a buildpack
To isomorphic.mokko.io:isomorphic-react
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'dokku@isomorphic.mokko.io:isomorphic-react'