安装chito1.1.0 rake 的时候出现如下错误

D:\chito>rake db:migrate
(in D:/chito)
rake aborted!
You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]

(See full trace by running task with --trace)
[b]问题补充：[/b]
D:\chito>rake db:migrate --trace
(in D:/chito)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
14001: 由于应用程序配置不正确，应用程序未能启动。重新安装应用程序可能会纠正这个
问题。 - d:/ruby/lib/ruby/gems/1.8/gems/rmagick-1.14.1-unknown/ext/RMagick.so
d:/ruby/lib/ruby/gems/1.8/gems/rmagick-1.14.1-unknown/ext/RMagick.so
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in require'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:inrequire'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:521:in new_constants_in'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:inrequire'
d:/ruby/lib/ruby/gems/1.8/gems/rmagick-1.14.1-unknown/lib/RMagick.rb:11
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in gem_original_re
quire'
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:inrequire'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:in require'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:521:innew_constants_in'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:in require'
D:/chito/vendor/plugins/simple_captcha/lib/simple_captcha_image.rb:4
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_re
quire'
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in require'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:inrequire'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:521:in new_constants_in'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:inrequire'
D:/chito/vendor/plugins/simple_captcha/init.rb:5:in evaluate_init_rb'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin.rb:103:inevaluate_
init_rb'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/core_ext/k
ernel/reporting.rb:11:in silence_warnings'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin.rb:99:inevaluate_i
nit_rb'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin.rb:44:in load'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin/loader.rb:33:inloa
d_plugins'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin/loader.rb:32:in eac
h'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/rails/plugin/loader.rb:32:inloa
d_plugins'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:323:in load_plugi
ns'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:160:inprocess'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:323:in load_plugi
ns'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:160:inprocess'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:112:in send'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/initializer.rb:112:inrun'
D:/chito/config/environment.rb:17
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in gem_original_re
quire'
d:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:in require'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:521:innew_constants_in'
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependenci
es.rb:153:in require'
d:/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/lib/tasks/misc.rake:3
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:incall'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:in execute'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:ineach'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:in execute'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:578:ininvoke_with_call_c
hain'
d:/ruby/lib/ruby/1.8/monitor.rb:242:in synchronize'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:ininvoke_with_call_c
hain'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:588:in invoke_prerequisit
es'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:ineach'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in invoke_prerequisit
es'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:577:ininvoke_with_call_c
hain'
d:/ruby/lib/ruby/1.8/monitor.rb:242:in synchronize'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:ininvoke_with_call_c
hain'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:564:in invoke'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2019:ininvoke_task'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in top_level'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:ineach'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in top_level'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:instandard_exceptio
n_handling'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1991:in top_level'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1970:inrun'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:in standard_exceptio
n_handling'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1967:inrun'
d:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/bin/rake:31
d:/ruby/bin/rake:19:in `load'
d:/ruby/bin/rake:19

我又仔细的看了一遍，并且我自己跑了一下，我的是可以用的
你的问题看着像是Rmaick的问题，要是不行的话，建议你重新下载

[url=http://rubyforge.org/frs/download.php/46136/RMagick-2.7.1-ImageMagick-6.4.5-3-Q8.zip]RMagick-2.7.1-ImageMagick-6.4.5-3-Q8.zip[/url]

安装，我是用的这个，因为，我看你是windows下的

解压缩，装一个exe，gem install一个gem，保证都不出错再运行

[code="linux"]rake db:create [/code]

[code="linux"]rake db:migrate[/code]

* Ruby 1.8.6 +
* Rails 2.0 +
* RMagick
* MySQL 数据库

这是人家的要求，而且
我的smtp总是不对所以，我把email.rb改了
#ActionMailer::Base.delivery_method = CHITO_CONFIG[:mail][:method]
#ActionMailer::Base.smtp_settings = CHITO_CONFIG[:mail][:settings]

[code="ruby"] # config/environments/development.rb
ActionMailer::Base.raise_delivery_errors = true

set delivery method to :smtp, :sendmail or :test

#config.action_mailer.
ActionMailer::Base.delivery_method = :smtp

these options are only needed if you choose smtp delivery

#config.action_mailer.
ActionMailer::Base.smtp_settings = {
:address => 'smtp.gmail.com',
:port => 587,
:authentication => :plain,
:user_name => 'user@gmail.com', #你的gmail帐号
:password => 'password' #你的gmail密码
}[/code]

参考吧，希望有帮助

先运行
[code="ruby"]
rake db:migrate --trace
[/code]
贴出跟踪信息

[quote]You might have expected an instance of ActiveRecord::Base. [/quote]

这是说少model吧，

那你先确认一下，你运行migrate之前，是不是运行过
[code="ruby"]rake db:create[/code]
或者，已经有对应的数据库表了？