Redmine

I‘m installing redmine in Justhost space.
follow this page: https://my.justhost.com/cgi/help/redmine

Stopped when create db, shows:

userc1@user.com [~/rails_apps/redmine]# rake db:migrate RAILS_ENV=production        
rake aborted!
uninitialized constant Redmine::Application

Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)
userc1@user.com [~/rails_apps/redmine]# 

Trace

userc1@user.com [~/rails_apps/redmine]# rake db:migrate RAILS_ENV=production --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
uninitialized constant Redmine::Application
/home4/userc1/rails_apps/redmine/config/initializers/secret_token.rb:7:in `<top (required)>'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/engine.rb:593:in `block (2 levels) in <class:Engine>'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/engine.rb:592:in `each'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/engine.rb:592:in `block in <class:Engine>'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/initializable.rb:30:in `instance_exec'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/initializable.rb:30:in `run'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/initializable.rb:55:in `block in run_initializers'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/initializable.rb:54:in `each'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/initializable.rb:54:in `run_initializers'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/application.rb:136:in `initialize!'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/railtie/configurable.rb:30:in `method_missing'
/home4/userc1/rails_apps/redmine/config/environment.rb:14:in `<top (required)>'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/application.rb:103:in `require_environment!'
/home4/userc1/ruby/gems/gems/railties-3.2.15/lib/rails/application.rb:305:in `block (2 levels) in initialize_tasks'
/usr/lib64/ruby/1.9.3/rake/task.rb:205:in `call'
/usr/lib64/ruby/1.9.3/rake/task.rb:205:in `block in execute'
/usr/lib64/ruby/1.9.3/rake/task.rb:200:in `each'
/usr/lib64/ruby/1.9.3/rake/task.rb:200:in `execute'
/usr/lib64/ruby/1.9.3/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/lib64/ruby/1.9.3/monitor.rb:211:in `mon_synchronize'
/usr/lib64/ruby/1.9.3/rake/task.rb:151:in `invoke_with_call_chain'
/usr/lib64/ruby/1.9.3/rake/task.rb:176:in `block in invoke_prerequisites'
/usr/lib64/ruby/1.9.3/rake/task.rb:174:in `each'
/usr/lib64/ruby/1.9.3/rake/task.rb:174:in `invoke_prerequisites'
/usr/lib64/ruby/1.9.3/rake/task.rb:157:in `block in invoke_with_call_chain'
/usr/lib64/ruby/1.9.3/monitor.rb:211:in `mon_synchronize'
/usr/lib64/ruby/1.9.3/rake/task.rb:151:in `invoke_with_call_chain'
/usr/lib64/ruby/1.9.3/rake/task.rb:144:in `invoke'
/usr/lib64/ruby/1.9.3/rake/application.rb:116:in `invoke_task'
/usr/lib64/ruby/1.9.3/rake/application.rb:94:in `block (2 levels) in top_level'
/usr/lib64/ruby/1.9.3/rake/application.rb:94:in `each'
/usr/lib64/ruby/1.9.3/rake/application.rb:94:in `block in top_level'
/usr/lib64/ruby/1.9.3/rake/application.rb:133:in `standard_exception_handling'
/usr/lib64/ruby/1.9.3/rake/application.rb:88:in `top_level'
/usr/lib64/ruby/1.9.3/rake/application.rb:66:in `block in run'
/usr/lib64/ruby/1.9.3/rake/application.rb:133:in `standard_exception_handling'
/usr/lib64/ruby/1.9.3/rake/application.rb:63:in `run'
/usr/bin/rake:32:in `<main>'
Tasks: TOP => db:migrate => environment

I don't know how to do.
help this, thanks.