ruby on rails - No such file to load -- 'gem name' using require -


i using gem differ https://github.com/pvande/differ

i have helper

require 'differ' module answershelper     def self.getdiff (text1, text2)         differ.format = :html         diff = differ.diff_by_word(@current, @original)     end end

but error no such file load -- differ

if remove require line error @ line 

differ.format = :html

uninitialized constant questionscontroller::differ

when tried following commands in rails console worked

require 'differ'  diff = differ.diff_by_word("text1","text2)

i have gem differ in gemfile , tried 

require_relative 'differ'

and

require './differ'

upd: seems restarting server helps, i'll check right now

restarting server helped........


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