Redactor integration problem

Hi Guys,

I am trying to implement Redactor into my app. It is for
the Member model which has a blog. I followed the instructions located here:
https://github.com/SammyLin/redactor-rails

But
still getting this error - Any thoughts on why this happens? Do You have experience with it? Do You know any other similar editor with image
upload? (I already use ckEditor in ActiveAdmin, and it would be nice for the Members too but I don’t know how I can create a new config to work with the member model):

Started POST "/redactor_rails/pictures?

authenticity_token=62nv7KKJET5NpaoPmm3rs%2BiYds3qPMgfTJDP2L8hF10%3D" for 127.0.0.1 at 2013-08-03 18:28:43 +0200
Processing by RedactorRails::PicturesController#create as HTML
Parameters: {“file”=>#<ActionDispatch::Http::UploadedFile:0x007ff1c5d5bab0 @original_filename=“100_2995.JPG”, @content_type=“image/jpeg”, @headers=“Content-Disposition: form-data; name=“file”; filename=“100_2995.JPG”\r\nContent-Type: image/jpeg\r\n”, @tempfile=#Tempfile:/var/folders/90/wjyhxjfs3gz3xkhsk8z_sz2w0000gn/T/RackMultipart20130803-4405-1cl023b>, “authenticity_token”=>“62nv7KKJET5NpaoPmm3rs+iYds3qPMgfTJDP2L8hF10=”}
Member Load (0.3ms) SELECT “members”.* FROM “members” WHERE “members”.“id” = 10 LIMIT 1
Completed 500 Internal Server Error in 2442ms

NameError (uninitialized constant RedactorRails::Asset::User):
activerecord (3.2.13) lib/active_record/inheritance.rb:111:in compute_type' activerecord (3.2.13) lib/active_record/reflection.rb:172:in klass’
activerecord (3.2.13) lib/active_record/associations/association.rb:202:in raise_on_type_mismatch' activerecord (3.2.13) lib/active_record/associations/belongs_to_association.rb:6:in replace’
activerecord (3.2.13) lib/active_record/associations/singular_association.rb:17:in writer' activerecord (3.2.13) lib/active_record/associations/builder/association.rb:51:in block in define_writers’
/usr/local/rvm/gems/ruby-2.0.0-p0/bundler/gems/redactor-rails-d0c1fc21420e/app/controller/redactor_rails/pictures_controller.rb:16:in create' actionpack (3.2.13) lib/action_controller/metal/implicit_render.rb:4:in send_action’
actionpack (3.2.13) lib/abstract_controller/base.rb:167:in process_action' actionpack (3.2.13) lib/action_controller/metal/rendering.rb:10:in process_action’
actionpack (3.2.13) lib/abstract_controller/callbacks.rb:18:in block in process_action' activesupport (3.2.13) lib/active_support/callbacks.rb:425:in _run__512611831908309020__process_action__292749284689078618__callbacks’
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in __run_callback' activesupport (3.2.13) lib/active_support/callbacks.rb:385:in _run_process_action_callbacks’
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (3.2.13) lib/abstract_controller/callbacks.rb:17:in process_action’
actionpack (3.2.13) lib/action_controller/metal/rescue.rb:29:in process_action' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:30:in block in process_action’
activesupport (3.2.13) lib/active_support/notifications.rb:123:in block in instrument' activesupport (3.2.13) lib/active_support/notifications/instrumenter.rb:20:in instrument’
activesupport (3.2.13) lib/active_support/notifications.rb:123:in instrument' actionpack (3.2.13) lib/action_controller/metal/instrumentation.rb:29:in process_action’
actionpack (3.2.13) lib/action_controller/metal/params_wrapper.rb:207:in process_action' activerecord (3.2.13) lib/active_record/railties/controller_runtime.rb:18:in process_action’
actionpack (3.2.13) lib/abstract_controller/base.rb:121:in process' actionpack (3.2.13) lib/abstract_controller/rendering.rb:45:in process’
actionpack (3.2.13) lib/action_controller/metal.rb:203:in dispatch' actionpack (3.2.13) lib/action_controller/metal/rack_delegation.rb:14:in dispatch’
actionpack (3.2.13) lib/action_controller/metal.rb:246:in block in action' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in call’
actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:73:in dispatch' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:36:in call’
journey (1.0.4) lib/journey/router.rb:68:in block in call' journey (1.0.4) lib/journey/router.rb:56:in each’
journey (1.0.4) lib/journey/router.rb:56:in call' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in call’
railties (3.2.13) lib/rails/engine.rb:479:in call' railties (3.2.13) lib/rails/railtie/configurable.rb:30:in method_missing’
journey (1.0.4) lib/journey/router.rb:68:in block in call' journey (1.0.4) lib/journey/router.rb:56:in each’
journey (1.0.4) lib/journey/router.rb:56:in call' actionpack (3.2.13) lib/action_dispatch/routing/route_set.rb:612:in call’
warden (1.2.3) lib/warden/manager.rb:35:in block in call' warden (1.2.3) lib/warden/manager.rb:34:in catch’
warden (1.2.3) lib/warden/manager.rb:34:in call' actionpack (3.2.13) lib/action_dispatch/middleware/best_standards_support.rb:17:in call’
rack (1.4.5) lib/rack/etag.rb:23:in call' rack (1.4.5) lib/rack/conditionalget.rb:35:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/head.rb:14:in call' actionpack (3.2.13) lib/action_dispatch/middleware/params_parser.rb:21:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/flash.rb:242:in call' rack (1.4.5) lib/rack/session/abstract/id.rb:210:in context’
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in call' actionpack (3.2.13) lib/action_dispatch/middleware/cookies.rb:341:in call’
activerecord (3.2.13) lib/active_record/query_cache.rb:64:in call' activerecord (3.2.13) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:28:in block in call' activesupport (3.2.13) lib/active_support/callbacks.rb:405:in _run__1647929714818531281__call__880499119694952234__callbacks’
activesupport (3.2.13) lib/active_support/callbacks.rb:405:in __run_callback' activesupport (3.2.13) lib/active_support/callbacks.rb:385:in _run_call_callbacks’
activesupport (3.2.13) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (3.2.13) lib/action_dispatch/middleware/callbacks.rb:27:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/reloader.rb:65:in call' actionpack (3.2.13) lib/action_dispatch/middleware/remote_ip.rb:31:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/debug_exceptions.rb:16:in call' actionpack (3.2.13) lib/action_dispatch/middleware/show_exceptions.rb:56:in call’
railties (3.2.13) lib/rails/rack/logger.rb:32:in call_app' railties (3.2.13) lib/rails/rack/logger.rb:16:in block in call’
activesupport (3.2.13) lib/active_support/tagged_logging.rb:22:in tagged' railties (3.2.13) lib/rails/rack/logger.rb:16:in call’
actionpack (3.2.13) lib/action_dispatch/middleware/request_id.rb:22:in call' rack (1.4.5) lib/rack/methodoverride.rb:21:in call’
rack (1.4.5) lib/rack/runtime.rb:17:in call' activesupport (3.2.13) lib/active_support/cache/strategy/local_cache.rb:72:in call’
rack (1.4.5) lib/rack/lock.rb:15:in call' actionpack (3.2.13) lib/action_dispatch/middleware/static.rb:63:in call’
railties (3.2.13) lib/rails/engine.rb:479:in call' railties (3.2.13) lib/rails/application.rb:223:in call’
rack (1.4.5) lib/rack/content_length.rb:14:in call' railties (3.2.13) lib/rails/rack/log_tailer.rb:17:in call’
rack (1.4.5) lib/rack/handler/webrick.rb:59:in service' /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/webrick/httpserver.rb:138:in service’
/usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/webrick/httpserver.rb:94:in run' /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/webrick/server.rb:295:in block in start_thread’

Rendered /usr/local/rvm/gems/ruby-2.0.0-p0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_trace.erb (2.1ms)
Rendered /usr/local/rvm/gems/ruby-2.0.0-p0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.6ms)
Rendered /usr/local/rvm/gems/ruby-2.0.0-p0/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (12.9ms)

Best Wishes,
Matt