Rake paperclip: update does not work on heroku

Question

I changed the paperclip styles and want to update them on the hero. I do as

heroku run rake --trace paperclip:refresh CLASS=VenueImage 

and get an error

 ** Invoke paperclip:refresh (first_time) ** Invoke paperclip:refresh:metadata (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute paperclip:refresh:metadata rake aborted! uninitialized constant VenueImage /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:179:in `block in class_for' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `each' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `inject' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `class_for' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/tasks/paperclip.rake:10:in `obtain_attachments' /app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/tasks/paperclip.rake:45:in `block (3 levels) in <top (required)>' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain' /usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain' /usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' /app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>' /app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `load' /app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `<main>' Tasks: TOP => paperclip:refresh => paperclip:refresh:metadata 

Now this VenueImage class definitely exists.

 heroku run console Loading production environment (Rails 3.2.2) irb(main):001:0> VenueImage => VenueImage(id: integer, venue_id: integer, image_file_name: string, image_content_type: string, image_file_size: integer, image_updated_at: datetime, created_at: datetime, updated_at: datetime) 

What can be done here?