Issue installing Nokogiri Gem w/ Rails: "Could not find "Nokogiri..."

Nokogiri is in my gem file. Bundle install returns the expected output:

Using nokogiri (1.4.4) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

When trying to execute db:create:all I get the following error:

rake db:create:all
Could not find nokogiri-1.4.4 in any of the sources

If I test in irb, I also get the expected output.

irb(main):003:0> require "rubygems"
=> true
irb(main):004:0> require "nokogiri"
=> true

I have uninstalled and install nokogiri along with its dependencies multiple times.

I'm using:

Rails 3.0.6 Ruby 1.8.7

Any help would be greatly appreciated. 开发者_如何转开发

EDIT: 4/25/11 3:02pm EDT

For comment below: Gemfile line for nokogiri is

gem "nokogiri", '1.4.4', :require => "nokogiri"

I made a test with your case in mind.
My Gemfile is like this:

gem "nokogiri", '1.4.4', :require => "nokogiri"

And then rake db:migrate worked just fine

This may be a long shot but you could try:

bundle install --no-deployment

If you are in deployment mode Rails will look for your gems in the vendor directory, rather then the usual install location. It can cause this kind of error.