I dont know guys how you fixed this problem. I have one rails app that 
runs as expected at port 80 using webrick. And another rails app running 
at port 3001, that doesnt start. I get the same error as you:

 ruby script/server -p 3001 -e production &
[2] 29028
root@li76-92:/home/magic/delivery/workspace/delivery-magic-wap# 
/usr/local/lib/site_ruby/1.8/rubygems.rb:232:in `activate': undefined 
method `map' for nil:NilClass (NoMethodError)
        from 
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:33:in `require'
        from 
/home/magic/delivery/workspace/delivery-magic-wap/vendor/rails/railties/lib/commands/server.rb:1
        from 
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in 
`gem_original_require'
        from 
/usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:29:in `require'
        from script/server:3


I uninstalled the multiple rails versions I had, and left the one that 
works for the other app 2.2.3. This is my gem list output:

gem list

*** LOCAL GEMS ***

actionmailer (2.2.3)
actionpack (2.2.3)
activemerchant (1.10.0)
activerecord (2.2.3)
activeresource (2.2.3)
activesupport (3.0.5, 2.2.3)
authlogic (2.1.6)
braintree (2.8.0)
builder (3.0.0)
i18n (0.4.2)
jabber4r (0.8.0)
json (1.5.1)
linecache (0.43)
rack (1.1.2, 1.0.1)
railroad (0.5.0)
rails (2.2.3)
rake (0.8.7)
ruby-debug-base (0.10.4)
ruby-debug-ide (0.4.16)
rubygems-update (1.4.2)
xmpp4r (0.5)


Everything seems ok, but I still get this anoying error. I'm not using 
apache, neither mongrel. Just trying to start with the default webrick..
The app works Ok at my development box, not at the VPS hosting.

Any clues and what could be wrong?

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