Forum: RForum RForm boot failure

i check out the source code from svn://andreas-s.net/rforum/trunk/
here is my database.yml:
production:
  adapter: mysql
  host: localhost
  database: rforum
  username: root
  password: 123

development:
  adapter: mysql
  host: localhost
  database: rforum
  username: root
  password: 123

test:
  adapter: mysql
  host: localhost
  database: rforum
  username: root
  password: 123

Here is my failure information:
  E:\projects\rforum>rake migrate
    (in E:/projects/rforum)
   rake aborted!
   no such file to load -- ferret
   E:/projects/rforum/rakefile.rb:9
  (See full trace by running task with --trace)
i wonder to know why?

Install ferret:
gem install ferret

Hi Andreas Schwarz:
 Thanks for your help, my problem is fixed;
 i boot Rforum successfully, but i find some errors in my log file,here 
it is:

NoMethodError (You have a nil object when you didn't expect it!
The error occured while evaluating nil.updated_at):
    /app/controllers/feed_controller.rb:42:in `render_feed'
    /app/controllers/feed_controller.rb:10:in `global'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:853:in 
`perform_action_without_filters'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/filters.rb:332:in 
`perform_action_without_benchmark'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in 
`perform_action_without_rescue'
    c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in 
`perform_action_without_rescue'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:82:in 
`perform_action'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in 
`process_without_session_management_support'
    c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in 
`process'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in 
`dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in 
`handle_dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83:in 
`service'
    c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
    c:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in 
`dispatch'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require'
    c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in 
`require'
    c:/ruby/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
    c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require'
    script/server:3

   Although there is no effect, but i still wonder to know why and how 
this error occur?

That happens when there are no posts for the Atom feeds. Fixed in 933.