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You must use Bundler 2 or greater with this lockfile. (Bundler::LockfileError) というエラーが出た

Posted at

##エラーの経緯
Rubyをrbenvにて管理しており、バージョン変更していた中でこのエラーに遭遇。

ターミナル
$ rails s
Traceback (most recent call last):
	5: from bin/rails:3:in `<main>'
	4: from bin/rails:3:in `load'
	3: from /Users/macbook/sample/bin/spring:10:in `<top (required)>'
	2: from /Users/macbook/sample/bin/spring:10:in `new'
	1: from /Users/macbook/.rbenv/versions/2.6.6/lib/ruby/2.6.0/bundler/lockfile_parser.rb:95:in `initialize'
/Users/macbook/.rbenv/versions/2.6.6/lib/ruby/2.6.0/bundler/lockfile_parser.rb:108:in `warn_for_outdated_bundler_version':You must use Bundler 2 or greater with this lockfile. (Bundler::LockfileError)

つまりはGemfile.lockとbundlerのバージョンが異なっており、Gemfile.lockに合わせたbundlerを使う必要があるとのこと。

##解決策

ターミナル
#Gemfile.lockでの記載を確認
$ tail -n2 Gemfile.lock
BUNDLED WITH
   2.2.3

#現在のバージョンを確認
$ bundler -v
Bundler version *.*.*(異なるバージョン)

#目的のバージョンをインストール
$ gem install bundler:2.2.3

$ rails s
Could not find i18n-1.8.10 in any of the sources
Run `bundle install` to install missing gems.

#不足しているgemをインストール
$ bundle install

#目的のバージョンがインストールされたことを確認
$ bundler -v
Bundler version 2.2.3

$rails s

無事起動を確認〜

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