Bundler: You must use Bundler 2 or greater with this lockfile

Question

I\'m working with heroku and every time I try to push my app this message shows out:

remote: Compressing source files... done.
remote: Building source:
remo         


        

Answer 1

Using bundler 2.0.1 allows for automatic version switching as required by the lock file. In this regard, installing bundler 2.0.1 worked for me.
Installing bundler 2.0.1
gem install bundler -v 2.0.1
Update bundler
bundle update -bundler