heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch

heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch

app[worker.1]: Don't know how to build task 'jobs:work' (see --tasks)

web: bundle exec rails server -p $PORT
worker:  bundle exec rake jobs:work