meteor-buildpack-horse: Push rejected, failure creating release

Hi,

I’m for the first time trying to deploy a Meteor app to Heroku. I just started out with the todos example, added the buildpack and tried to push the comitted code. Everything seems to go fine, but somehow the push is rejected and the build fails.

Rick:todos rkplas$ git push heroku master
Counting objects: 113, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (108/108), done.
Writing objects: 100% (113/113), 247.42 KiB | 0 bytes/s, done.
Total 113 (delta 3), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Fetching custom git buildpack... done
remote: -----> Node.js app detected
remote: -----> Installing node
remote: -----> Installing meteor
remote: Downloading Meteor distribution
remote: ######################################################################## 100.0%
remote: 
remote: Meteor 1.0.2.1 has been installed in your home directory (~/.meteor).
remote: 
remote: Now you need to do one of the following:
remote: 
remote:   (1) Add "$HOME/.meteor" to your path, or
remote:   (2) Run this command as root:
remote:         cp "/tmp/buildpack_60aea2829a59bc7586e9d5738213406b/meteor-eDih/.meteor/packages/meteor-tool/1.0.38/meteor-tool-os.linux.x86_64/scripts/admin/launch-meteor" /usr/bin/meteor
remote: 
remote: Then to get started, take a look at 'meteor --help' or see the docs at
remote: docs.meteor.com.
remote: -----> Bundling bundle
remote: ios: removed platform
remote: android: removed platform
remote: npm WARN package.json meteor-dev-bundle@0.0.0 No description
remote: npm WARN package.json meteor-dev-bundle@0.0.0 No repository field.
remote: npm WARN package.json meteor-dev-bundle@0.0.0 No README data
remote: 
remote: > fibers@1.0.1 install /tmp/build_60aea2829a59bc7586e9d5738213406b/.meteor/heroku-build/app/programs/server/node_modules/fibers
remote: > node ./build.js
remote: 
remote: `linux-x64-v8-3.14` exists; testing
remote: Binary is fine; exiting
remote: underscore@1.5.2 node_modules/underscore
remote: 
remote: semver@4.1.0 node_modules/semver
remote: 
remote: chalk@0.5.1 node_modules/chalk
remote: ├── escape-string-regexp@1.0.2
remote: ├── ansi-styles@1.1.0
remote: ├── supports-color@0.2.0
remote: ├── strip-ansi@0.3.0 (ansi-regex@0.2.1)
remote: └── has-ansi@0.1.0 (ansi-regex@0.2.1)
remote: 
remote: eachline@2.3.3 node_modules/eachline
remote: └── type-of@2.0.1
remote: 
remote: source-map-support@0.2.8 node_modules/source-map-support
remote: └── source-map@0.1.32 (amdefine@0.1.0)
remote: 
remote: fibers@1.0.1 node_modules/fibers
remote: -----> Adding PATH environment
remote: -----> Running extras
remote: -----> Adding MONGOHQ_URL -> MONGO_URL env
remote: -----> Adding MONGOLAB_URI -> MONGO_URL env
remote: -----> Installing phantomjs.
remote: -----> Discovering process types
remote:        Procfile declares types   -> (none)
remote:        Default types for Node.js -> web
remote: 
remote: -----> Compressing... done, 26.4MB
remote: -----> Launching... 
remote:  !     Push rejected, failure creating release
remote: 
remote: Verifying deploy...
remote: 
remote: !   Push rejected to salty-tundra-1782.
remote: 
To https://git.heroku.com/salty-tundra-1782.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/salty-tundra-1782.git'