Unable to deploy rails app to heroku (Could not detect rake tasks)

Question

I'm having this error when i'm trying to deploy to Heroku:

Could not detect rake tasks, ensure you can run $ bundle exec rake -P against your app and using the production group of your Gemfile. cannot load such file -- bootsnap/setup (LoadError)

Rails 5.4.4.2 Ruby 2.6.3 Bootsnap 1.7.0 Heroku Stack 18

Answer 1

ok, solved by using bundler 1.17.2 instead of 2.2.8