Issue with actionpack reference

[adityai]

I have a simple rb file that just has:
require 'muni'
muni list

Local version of ruby: 2.4.1

I have the following error when I executed this ruby file:
/usr/local/lib/ruby/gems/2.4.0/gems/actionpack-1.4.0/lib/action_view/base.rb:129:in <class:Base>': undefined method cattr_accessor' for ActionView::Base:Class (NoMethodError)
Did you mean? attr_accessor
from /usr/local/lib/ruby/gems/2.4.0/gems/actionpack-1.4.0/lib/action_view/base.rb:119:in <module:ActionView>' from /usr/local/lib/ruby/gems/2.4.0/gems/actionpack-1.4.0/lib/action_view/base.rb:3:in <top (required)>'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require'
from /usr/local/lib/ruby/gems/2.4.0/gems/actionpack-1.4.0/lib/action_view.rb:33:in <top (required)>' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:120:in require'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:120:in require' from /usr/local/lib/ruby/gems/2.4.0/gems/muni-0.0.8/lib/muni/prediction.rb:1:in <top (required)>'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require'
from /usr/local/lib/ruby/gems/2.4.0/gems/muni-0.0.8/lib/muni/stop.rb:2:in <top (required)>' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require' from /usr/local/lib/ruby/gems/2.4.0/gems/muni-0.0.8/lib/muni/route.rb:4:in <top (required)>'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:68:in require'
from /usr/local/lib/ruby/gems/2.4.0/gems/muni-0.0.8/lib/muni.rb:2:in <top (required)>' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in require'
from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:133:in rescue in require' from /usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:40:in require'
from muni1.rb:1:in `

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