carrierwave thumb issue

This question was asked, but no answer given...I'm having the same issue. I'm using carrierwave for uploading files everything works great until i wanted to create thumbs images are saved in a tmp direct, but kept at the same size... My avatar_uploader.rb file looks like this: ``` class AvatarUploader < CarrierWave::Uploader::Base include CarrierWave::RMagick storage :file def store_dir "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" end version :thumb do process :resize_to_limit => [200, 200] end ``` My view has the following: ``` <% for image in @posts %> <%= image_tag image.avatar_url(:thumb) if image.avatar? %> <%= image.title %> <% end %> ``` When I don't include (:thumb), I see the full images...but when I do include the (:thumb), I get the following error: ``` Version thumb doesn't exist! ``` below is my model setup ``` class Post < ActiveRecord::Base attr_accessible :comments, :frame, :title, :twitter, :avatar belongs_to :user mount_uploader :avatar, AvatarUploader end ``` I can see that a tmp directory was created, but images not resized...I have imagemagick and rmagick installed... Thank you