jquery - Jcrop error: undefined method 'sub' -

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rails 4.0.10: i've been following jcrop tutorial: (http://railscasts.com/episodes/182-cropping-images), , i've gotten far submitting cropped image. when press submit button, error:

nomethoderror in thingscontroller#update undefined method `sub' ["-auto-orient", "-resize", "\"500x500\""]:array

i saw question same error, fixed changing super.sub(/ -crop... in lib/paperclip_processor/cropper "super.first.sub(/ -c..., returned same exact error in case. has else run issue jcrop?

lib/paperclip_processors/cropper (i put asterisks around line highlighted on error page)

module paperclip   class cropper < thumbnail     def transformation_command       if crop_command         ***crop_command + super.sub(/ -crop \s+/, '')***       else         super       end     end      def crop_command       target = @attachment.instance       if target.cropping?         " -crop '#{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y}' "       end     end   end end

views/things/crop.html.erb

<% content_for(:head) %> <%= stylesheet_link_tag "jquery.jcrop" %> <%= javascript_include_tag "jquery.jcrop.min" %> <script type="text/javascript" charset="utf-8"> ready = $(function() {   $("#cropbox").jcrop({     onchange: update_crop,     onselect: update_crop,     setselect: [0, 0, 500, 500],     aspectratio: 1   }); });  function update_crop(coords) {   $("#crop_x").val(coords.x);   $("#crop_y").val(coords.y);   $("#crop_w").val(coords.w);   $("#crop_h").val(coords.h); }  $(document).ready(ready); $(document).on('page:load', ready);  </script> <% end %>  <%= image_tag @thing.avatar.url(:large), :id => "cropbox" %>  <%= form_for @thing |f| %>   <% attribute in [:crop_x, :crop_y, :crop_w, :crop_h] %>     <%= f.text_field attribute, :id => attribute %>   <% end %>   <p><%= f.submit "crop" %></p> <% end %>

models/thing.rb

class thing < activerecord::base   # ...   has_attached_file :avatar, :styles => { :large => "500x500", :medium => "300x300>", :thumb => "50x50!" }, :processors => [:cropper]   validates_attachment_content_type :avatar, :content_type => /\aimage\/.*\z/   attr_accessor :crop_x, :crop_y, :crop_w, :crop_h   after_update :reprocess_avatar, :if => :cropping?      def cropping?     !crop_x.blank? && !crop_y.blank? && !crop_w.blank? && !crop_h.blank?   end    private    def reprocess_avatar     avatar.reprocess!   end  end


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