Problem with videos on heroku

Hi,
I have recently moved my RoR app on the Heroku platform, and almost
everything works fine apart from the videos. It works fine when my app
runs in local but not on heroku. This is the error log I’m getting, if
anyone knows where it can be coming from:

Processing VideosController#new (for IP at 2010-03-20 04:32:09) [GET]
Session ID: 6abecf60c3369d7c7029e366bb801e08
Parameters: {“artist_id”=>“10”, “action”=>“new”,
“controller”=>“admin/videos”}
Rendering within layouts/admin
Rendering admin/videos/new

ActionView::TemplateError (undefined method `video_file_relative_path’
for #Video:0x2adc9839fe28) on line #21 of app/views/admin/videos/
_form.rhtml:
18:
19:

Fichier Vidéo SWF

20: <% if @video.video_file %>
21: <%= link_to image_tag(url_for_file_column(“video”,
“video_file”, :name => “thumbnail”))+"
", {:controller =>
url_for_file_column(“video”, “video_file”)}, :popup => [‘new_window’,
‘height=200,width=200’] %>
22: <% end %>
23: <%= file_column_field ‘video’, ‘video_file’ %>
24:    

#{RAILS_ROOT}/vendor/rails/activerecord/lib/active_record/base.rb:

1792:in method_missing' #{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column_helper.rb: 75:insend’
#{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column_helper.rb:
75:in url_for_file_column' #{RAILS_ROOT}/app/views/admin/videos/_form.rhtml:21:in_run_rhtml_admin_videos__form’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
314:in send' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb: 314:incompile_and_render_template’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
290:in render_template' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb: 249:inrender_file’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
264:in render' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/partials.rb: 59:inrender_partial’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
benchmarking.rb:33:in benchmark' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/partials.rb: 58:inrender_partial’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
276:in render' #{RAILS_ROOT}/app/views/admin/videos/new.rhtml:4:in_run_rhtml_admin_videos_new’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
314:in send' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb: 314:incompile_and_render_template’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb:
290:in render_template' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_view/base.rb: 249:inrender_file’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
base.rb:699:in render_file' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ base.rb:621:inrender_with_no_layout’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
layout.rb:243:in render_without_benchmark' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ benchmarking.rb:53:inrender’
/usr/local/lib/ruby/1.8/benchmark.rb:293:in measure' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ benchmarking.rb:53:inrender’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
base.rb:911:in perform_action_without_filters' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ filters.rb:368:inperform_action_without_benchmark’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
benchmarking.rb:69:in perform_action_without_rescue' /usr/local/lib/ruby/1.8/benchmark.rb:293:inmeasure’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
benchmarking.rb:69:in perform_action_without_rescue' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ rescue.rb:82:inperform_action’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
base.rb:381:in send' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ base.rb:381:inprocess_without_filters’
#{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/
filters.rb:377:in process_without_session_management_support' #{RAILS_ROOT}/vendor/rails/actionpack/lib/action_controller/ session_management.rb:117:inprocess’
#{RAILS_ROOT}/vendor/rails/railties/lib/dispatcher.rb:38:in
dispatch' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/rack/adapter/ rails.rb:60:inserve_rails’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/rack/adapter/
rails.rb:80:in call' /home/heroku_rack/lib/static_assets.rb:9:incall’
/home/heroku_rack/lib/last_access.rb:25:in call' /usr/local/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb: 46:incall’
/usr/local/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb:
40:in each' /usr/local/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/urlmap.rb: 40:incall’
/home/heroku_rack/lib/date_header.rb:14:in call' /usr/local/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/builder.rb: 60:incall’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/
connection.rb:80:in pre_process' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/ connection.rb:78:incatch’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/
connection.rb:78:in pre_process' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/ connection.rb:57:inprocess’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/
connection.rb:42:in receive_data' /usr/local/lib/ruby/gems/1.8/gems/eventmachine-0.12.6/lib/ eventmachine.rb:240:inrun_machine’
/usr/local/lib/ruby/gems/1.8/gems/eventmachine-0.12.6/lib/
eventmachine.rb:240:in run' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/backends/ base.rb:57:instart’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/server.rb:
150:in start' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/controllers/ controller.rb:80:instart’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/runner.rb:
173:in send' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/runner.rb: 173:inrun_command’
/usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/lib/thin/runner.rb:
139:in run!' /usr/local/lib/ruby/gems/1.8/gems/thin-1.0.1/bin/thin:6 /usr/local/bin/thin:20:inload’
/usr/local/bin/thin:20

Thanks,

Roch