All of my review apps are failing creation during the Run Scripts & Scale Dynos part of app creation. I’m only getting this single line in my release.log file:

/app/.platform_tools/elixir/bin/elixir: 123: exec: erl: not found

Here is my app.json file:

{
  "name": "my-app",
  "scripts": {
  },
  "env": {
    "AWS_ACCESS_KEY_ID": {
      "required": true
    },
    "AWS_SECRET_ACCESS_KEY": {
      "required": true
    },
    "GUARDIAN_SECRET": {
      "required": true
    },
    "HONEYBADGER_API_KEY": {
      "required": true
    },
    "IMAGE_HOST": {
      "required": true
    },
    "POOL_SIZE": {
      "required": true
    },
    "SECRET_KEY_BASE": {
      "required": true
    }
  },
  "formation": {
    "web": {
      "quantity": 1
    }
  },
  "addons": [
    "heroku-postgresql"
  ],
  "buildpacks": [
    {
      "url": "https://github.com/HashNuke/heroku-buildpack-elixir.git"
    }
  ]
}

and my elixir_buildpack.config

erlang_version=21.1
elixir_version=1.7.3

I really have no leads at this point so any help would be great. Thanks!