【AWS EC2】`find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundler (Gem::GemNotFoundException)

あなたのターミナルにはこのようなエラーが出ていますか？

[ec2-user@ip-XXX-XX-XX-XXX xxxxxx]$ bundler -v
Traceback (most recent call last):
    2: from /home/ec2-user/.rbenv/versions/2.5.1/bin/bundler:23:in `<main>'
    1: from /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems.rb:308:in `activate_bin_path'
/home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/2.5.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundler (Gem::GemNotFoundException)

入力するコマンド

$ rbenv exec gem install bundler
$ bundle install

この順で実行すればOK

参考記事

[エラーメッセージ] can't find gem bundler (>= 0.a) with executable bundler (Gem::GemNotFoundException)
https://qiita.com/MotohiroSiobara/items/c0d343a160cffc2902ef