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

I had same issue on Local Machine(Development) as-

You must use Bundler 2 or greater with this lockfile.
The issue was with gemfile.lock because my local bundle version and project bundle version was not matching! Here is solution-

1. I deleted gemfile.lock
2. Run the command - bundle install
   That solved my problem, it is smooth! Hope will work for others!