I am building Rails 4.x app that runs on Heroku. And I recently added browserify-rails to the app then I got an error below while deploying it to Heroku. BrowserifyRails::BrowserifyError: browserify could not be found at /tmp/build_7afd0a3da809f3510421bfa4737d3bf8/./node_modules/.bin/browserify. Please run npm install. I've tried a lot of thing and finally found the solution. Here is the process f