why is there an error in my counter method?

[lord12]

class BrowserCount
  def initialize(file =  "browsers.txt")
    @file_lines = Array.new
    @file = file
  end
  
  def counter
    read_file
    @hash = Hash.new
    @files_lines.uniq.each do |line|
    count = 0
      @file_lines.each do |x|
        if x == line
          count +=1
        end
      end
      @hash[line]=count
    end
    @hash
  end
  
  private
  
  def read_file
    if @file_lines.empty?
    @open_file = File.open(@file)
    @file_lines = @open_file.readlines()
    end
  end
end
B = BrowserCount.new
B.counter

I don't understand why there is an error with @file_lines in my counter method. The error is: browser_count.rb:10:in `counter': undefined method `uniq' for nil:NilClass (NoMethodError) from browser_count.rb:32

[lo0ol]

You set a @file_lines variable; on 10 you're looking for @files_lines.

[lord12]

but I call read_file

[lo0ol]

@files_lines.uniq.each do |line|

vs.

@file_lines = @open_file.readlines()


file_lines != files_lines