rails newがうまく機能しません

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
（例）PHP(CakePHP)で●●なシステムを作っています。
■■な機能を実装中に以下のエラーメッセージが発生しました。

発生している問題・エラーメッセージ

rails newをやっても作られません

エラーメッセージ

ec2-user:~/environment $ rails new blog
/home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler/rubygems_ext.rb:17:in remove_method': method source' not defined in Gem::Specification (NameError)
from /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler/rubygems_ext.rb:17:in <class:Specification>' from /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler/rubygems_ext.rb:14:in module:Gem'
from /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler/rubygems_ext.rb:13:in <top (required)>' from /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler.rb:10:in require_relative'
from /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/bundler-2.1.4/lib/bundler.rb:10:in <top (required)>' from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:135:in require'
from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:135:in rescue in require' from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:144:in require'
from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/bundler-unload-1.0.2/lib/bundler-unload.rb:1:in <top (required)>' from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in require'
from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in require' from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:82:in setup'
from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:124:in check' from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:131:in <top (required)>'
from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:135:in require' from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:135:in rescue in require'
from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:144:in require' from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/rubygems-bundler-1.4.5/lib/rubygems_executable_plugin.rb:4:in block in <top (required)>'
from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:50:in call' from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:50:in block in run'
from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in each' from /home/ec2-user/.rvm/gems/ruby-2.5.1@global/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in run'
from /home/ec2-user/.rvm/gems/ruby-2.5.1/bin/ruby_executable_hooks:10:in `<main>'