`require': cannot load such file -- bundler/setup (LoadError)

Question

I am getting started with ruby on rails, but facing a lot of issues setting up a new blog from ruby tutorials.

I had installed ruby 2.3.0 using rubyenv on my Mac El Capitan. But soon after I ran into namespace conflicts and errors. I solved them one by one but now when I run

bin/rails generate controller welcome index

on the new blog, I get -

/Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- bundler/setup (LoadError)

Why does it show 2.0.0 when I've installed 2.3.0?

Stuff I've tried:

$ sudo gem update --system

$ export PATH="$HOME/.rbenv/shims:$PATH"

$ echo $GEM_HOME <returns blank>

$which -a ruby

/Users/shubhamkanodia/.rbenv/shims/ruby
/usr/bin/ruby

rbenv versions

  system
* 2.3.0 (set by /Users/shubhamkanodia/.rbenv/version)

Answer 1

maybe fix bundle exec rake rails:update:bin