I’ve been using Meteor since 0.6.x and not too long ago Meteor was using a package system called meteorite. Now with Meteor 1.0, meteorite has been deprecated so this ultimately changes the way you can deploy your application should you want to do that with a Heroku buildpack.
I was getting exceptions with fibers and a recommendation to add ROOT_URL to my config which I didn’t have to do previously on version 0.9.3. But once I updated to this buildpack: https://github.com/AdmitHub/meteor-buildpack-horse, life was good. I also added the ROOT_URL: [http://myapp.com] to my config and I was back to successfully deploying my Meteor app using this new buildpack which has no dependency on meteorite.