Internal Fatal Error

Error:

ActionView::TemplateError (No such file or directory - /home/edouard/production/memiki/public//user_files/ecovillages/a_la_decouverte_plante_jura.pdf) on line #128 of app/views/pages/atom.rxml:
125:                     # create base64
126:                     next unless attach.pathname.any?
127:                     content_string = 
128:                         File.open( "#{RAILS_ROOT}/public/" + 
129:                                     attach.pathname, 'rb') { | file | file.read }
130:                     xml.target! << 
131:                         "<max:attachment pathname=\"#{ENV['RAILS_RELATIVE_URL_ROOT']||'' + attach.pathname}\">\n"

    app/views/pages/atom.rxml:128:in `initialize'
    app/views/pages/atom.rxml:128:in `open'
    app/views/pages/atom.rxml:128
    app/views/pages/atom.rxml:124
    app/views/pages/atom.rxml:57
    app/views/pages/atom.rxml:53:in `each'
    app/views/pages/atom.rxml:53
    app/views/pages/atom.rxml:18:in `_run_rxml_app47views47pages47atom46rxml'
    app/controllers/pages_controller.rb:228:in `atom'
    unicorn (0.990.0) lib/unicorn.rb:637:in `process_client'
    unicorn (0.990.0) lib/unicorn.rb:710:in `worker_loop'
    unicorn (0.990.0) lib/unicorn.rb:708:in `each'
    unicorn (0.990.0) lib/unicorn.rb:708:in `worker_loop'
    unicorn (0.990.0) lib/unicorn.rb:599:in `spawn_missing_workers'
    unicorn (0.990.0) lib/unicorn.rb:596:in `fork'
    unicorn (0.990.0) lib/unicorn.rb:596:in `spawn_missing_workers'
    unicorn (0.990.0) lib/unicorn.rb:592:in `each'
    unicorn (0.990.0) lib/unicorn.rb:592:in `spawn_missing_workers'
    unicorn (0.990.0) lib/unicorn.rb:606:in `maintain_worker_count'
    unicorn (0.990.0) lib/unicorn.rb:270:in `start'
    unicorn (0.990.0) lib/unicorn.rb:28:in `run'
    unicorn (0.990.0) bin/unicorn_rails:181
    /usr/bin/unicorn_rails:19:in `load'
    /usr/bin/unicorn_rails:19