Cannot load prawn

[floer32]

I don't know Ruby much so I don't know the nature of this yet, but I got this error today.

$ ruby generate.rb 1990 --letter
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- prawn (LoadError)
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/x/Workspace/mortalical/calendar.rb:1:in `<top (required)>'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from generate.rb:1:in `<main>'

Here was the output when I did bundle install, if that's helpful

$ bundle install --path vendor/bundle
Fetching gem metadata from https://rubygems.org/...............
Installing pdf-core 0.4.0
Installing ttfunk 1.4.0
Installing prawn 1.3.0
Using bundler 1.7.3
Your bundle is complete!
It was installed into ./vendor/bundle
Post-install message from prawn:

  ********************************************


  A lot has changed recently in Prawn.

  Please read the changelog for details:

  https://github.com/prawnpdf/prawn/wiki/CHANGELOG


  ********************************************

[floer32]

I tried constraining my version of prawn to an older one (just tried to cross reference the timing from your repo and prawn. Didn't help:

$ bundle install
Fetching gem metadata from https://rubygems.org/
Fetching version metadata from https://rubygems.org/
Installing pdf-core 0.4.0
Installing ttfunk 1.4.0
Using bundler 1.12.5
Installing prawn 1.3.0
Bundle complete! 1 Gemfile dependency, 4 gems now installed.
Bundled gems are installed into ./vendor/bundle.
Post-install message from prawn:

  ********************************************


  A lot has changed recently in Prawn.

  Please read the changelog for details:

  https://github.com/prawnpdf/prawn/wiki/CHANGELOG


  ********************************************


$ ruby generate.rb 1990 --letter
/Users/x/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- prawn (LoadError)
    from /Users/x/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/x/Workspace/mortalical/calendar.rb:1:in `<top (required)>'
    from /Users/x/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/x/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from generate.rb:1:in `<main>'

Would love to help more but I'm very unfamiliar with Ruby and bundling I guess. I may tinker more...