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Check on the stack trace just below the following lines, you’ll be able to see the error;
-----> Waiting for 35 seconds ...
remote: App container failed to start!!
=====> yourAppName container output:
/app/.meteor/heroku_build/app/programs/server/node_modules/fibers/future.js:245
throw(ex);```
If the error is, Error: MONGO_URL must be set in environment. Then it's evident that you haven't created your database for the app.
If the error is, Error: ROOT_URL must be set in environment. Then you'll need to set-up your root_url in the environment.
This resource might be of help, [Dokku on DigitalOcean](https://www.youtube.com/watch?v=xpD9AOcWlgc)
Been running into this problem but figured out. Hope this helps. :)
You need to remove .deploy.lock file if exists in your application folder
rm -rf /home/dokku/YOUR_APP_NAME/.deploy.lock
Check memory usage on the box. I’ve often seen it complain like that when its struggled to build the instance. Or try clearing the git repo on the server.