ArgumentError: comparison of Array with Array failed

[marlonoso]

Getting error with some combinations of :contents
No matter if they are short or long ones
This is just an example

    corpus = Corpus.new

    doc1 = Document.new(:content => "moved")
    doc2 = Document.new(:content => "public")
    doc3 = Document.new(:content => "moved")

    [doc1, doc2, doc3].each { |doc| corpus << doc }

    corpus.similar_documents(doc2).each do |doc, similarity|
     puts "Similarities between doc #{doc1.id} and doc #{doc.id} is #{similarity}"
    end

And this is the Exception

ArgumentError: comparison of Array with Array failed
from /home/marlon/.rvm/gems/ruby-2.2.0/bundler/gems/Similarity-58c0952c380b/lib/similarity/corpus.rb:62:in sort' from /home/marlon/.rvm/gems/ruby-2.2.0/bundler/gems/Similarity-58c0952c380b/lib/similarity/corpus.rb:62:insimilar_documents