No such file or directory

Hello All,

Periodically I have get from live site the following error via email
that send me from rescue action of application.rb
What do you think happen ? Rails run under FastCGI.

Regards,
Pavel

Error Msg:
No such file or directory

Trace Msg:
C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/
cgi_process.rb:217:in `flush'C:/ruby/lib/ruby/gems/1.8/gems/
actionpack-2.1.1/lib/action_controller/cgi_process.rb:217:in `out'C:/
ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/action_controller/
dispatcher.rb:149:in `handle_request'C:/ruby/lib/ruby/gems/1.8/gems/
actionpack-2.1.1/lib/action_controller/dispatcher.rb:107:in
`dispatch'C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/
action_controller/dispatcher.rb:104:in `synchronize'C:/ruby/lib/ruby/
gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:
104:in `dispatch'C:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.1.1/lib/
action_controller/dispatcher.rb:120:in `dispatch_cgi'C:/ruby/lib/ruby/
gems/1.8/gems/actionpack-2.1.1/lib/action_controller/dispatcher.rb:
35:in `dispatch'C:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/
fcgi_handler.rb:103:in `process_request'C:/ruby/lib/ruby/gems/1.8/gems/
rails-2.1.1/lib/fcgi_handler.rb:153:in `with_signal_handle
r'C:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/fcgi_handler.rb:
101:in `process_request'C:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/
fcgi_handler.rb:78:in `process_each_request'C:/ruby/lib/ruby/site_ruby/
1.8/fcgi.rb:598:in `each_cgi'C:/ruby/lib/ruby/site_ruby/1.8/fcgi.rb:
595:in `each'C:/ruby/lib/ruby/site_ruby/1.8/fcgi.rb:595:in
`each_cgi'C:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/
fcgi_handler.rb:77:in `process_each_request'C:/ruby/lib/ruby/gems/1.8/
gems/rails-2.1.1/lib/fcgi_handler.rb:76:in `catch'C:/ruby/lib/ruby/
gems/1.8/gems/rails-2.1.1/lib/fcgi_handler.rb:76:in
`process_each_request'C:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/
fcgi_handler.rb:50:in `process!'C:/ruby/lib/ruby/gems/1.8/gems/
rails-2.1.1/lib/fcgi_handler.rb:24:in `process!'../public/
dispatch.fcgi:24