keep getting "undefined method `map' for nil:NilClass (NoMethodError) " in new server

hi guys,

I have a new development server (ubuntu 10).
I have done the following (the versions match my existing development
machine which works fine):
1. installed ruby 1.9.1p378
2. installed ruby gems 1.3.7
3. installed rails 2.3.8 (used "gem install rails -v 2.3.8")
4. manually installed my other gems including sphinx and thinking
sphinx with "gem install ..."
5. ran "sudo apt-get install ruby-dev ruby ri rdoc irb libreadline-
ruby libruby libopenssl-ruby sqlite3 libsqlite3-ruby libsqlite-dev
libsqlite3-dev"

here's what "gem list --local" gives me:

root@ct9a-dev:~/projects/myApp# gem list --local

*** LOCAL GEMS ***

actionmailer (2.3.9)
actionpack (2.3.9)
activemodel (3.0.3)
activerecord (3.0.3, 2.3.9)
activeresource (2.3.9)
activesupport (3.0.3, 2.3.9)
arel (2.0.6)
authlogic (2.1.6)
breadcrumbs_on_rails (1.0.1)
builder (2.1.2)
i18n (0.5.0)
paperclip (2.3.8)
prawn (0.8.4)
prawn-core (0.8.4)
prawn-layout (0.8.4)
prawn-security (0.8.4)
rack (1.1.0)
rails (2.3.9)
rake (0.8.7)
riddle (1.2.2)
rubygems-update (1.3.7)
searchlogic (2.4.27)
thinking-sphinx (2.0.1)
tzinfo (0.3.23)
will_paginate (2.3.15)

problem: