getting a 'Normal is not a module (TypeError)' when using derailed_benchmarks gem

[dfuentes77]

when trying to run bundle exec derailed bundle:mem

/distribution-0.7.3/lib/distribution/normal/ruby.rb:2:in `<module:Distribution>': Normal is not a module (TypeError)

block at top of said file:

module Distribution
  module Normal
    module Ruby_
      class << self

I've had to add require: false to the Gem, just to get passed this and for the commands to finally work.