We ran into the same issue. You can follow the issue here.
https://rails.lighthouseapp.com/projects/8994/tickets/4690-mongrel-doesnt-work-with-rails-238
The fixes in the these posts did the trick for us:
Edgars Beigarts May 26th, 2010 @ 07:03 PM
bshand June 10th, 2010 @ 12:08 PM
Hope this helps!
-James
On Jun 13, 3:34 pm, structuralartistry <[email protected]> wrote:
> I am having different results between when I start mongrel with script/
> server and with mongrel_rails start.
>
> When I run script/server to boot mongrel everything runs fine, no
> errors.
>
> When I run mongrel_rails start I get the following errors - verified
> the problem on a fresh app and on two different environments (mac and
> yes, windows server 2008). The actual line of fault changes but the
> problem is always originating in /usr/local/bin/mongrel_rails:19
>
> I would very much appreciate any ideas.
>
> David
>
> C:\webapps\creditcompare>mongrel_rails start -e production
> ** Starting Mongrel listening at 0.0.0.0:3000
> ** Starting Rails with production environment...
> ** Rails loaded.
> ** Loading any Rails specific GemPlugins
> C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:89:in
> `read': can't convert Hash into Integer (TypeError)
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:89:in `load_specification'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:153:in `load_gems_in'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:152:in `each'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:152:in `load_gems_in'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:149:in `reverse_each'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:149:in `load_gems_in'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:345:in `refresh!'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:78:in `from_gems_in'
> from C:/Ruby187/lib/ruby/site_ruby/1.8/rubygems/
> source_index.rb:60:in `from_installed_gems'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/gem_plugin-0.2.3/lib/
> gem_plugin.rb:109:in `load'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/configurator.rb:231:in `load
> _plugins'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/mongrel_rails:117:in `cloaker_'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/configurator.rb:149:in `call
> '
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/configurator.rb:149:in `list
> ener'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/mongrel_rails:99:in `cloaker_'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/configurator.rb:50:in `call'
>
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/configurator.rb:50:in `initi
> alize'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/mongrel_rails:84:in `new'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/mongrel_rails:84:in `run'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/../lib/mongrel/command.rb:212:in `run'
> from C:/Ruby187/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-
> mingw32/bin/mongrel_rails:281
> from C:/Ruby187/bin/mongrel_rails:19:in `load'
> from C:/Ruby187/bin/mongrel_rails:19
>
> C:\webapps\creditcompare>
>
> Sun Jun 13 13:12:32 -0700 2010: Error calling Dispatcher.dispatch
> #<NoMethodError: 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.[]>
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> cgi.rb:108:in `send_cookies'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> cgi.rb:136:in `out'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> http_response.rb:65:in `start'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> cgi.rb:135:in `out'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> rails.rb:81:in `process'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 159:in `process_client'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 158:in `each'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 158:in `process_client'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 285:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 285:in `initialize'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 285:in `new'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 285:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 268:in `initialize'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 268:in `new'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel.rb:
> 268:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> configurator.rb:282:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> configurator.rb:281:in `each'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> configurator.rb:281:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:
> 128:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/../lib/mongrel/
> command.rb:212:in `run'
> /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
> /usr/local/bin/mongrel_rails:19:in `load'
> /usr/local/bin/mongrel_rails:19
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