Load constant

I'm having trouble for instance the Report model.

Console:

LoadError (Unable to autoload constant Report_questao, expected app/models/report.rb to define it):
  app/controllers/pessoas_controller.rb:49:in 'reportar'

controller:

require 'report'

class QuestoesController < ApplicationController
def reportar
    @report = report.new
  end
end

Model:

report.rb

class Report < ActiveRecord::Base

  belongs_to :pessoa

end