active_adaptor (MissingSourceFile)

Hi,

Need a small help. Which package has "active_adaptor"? Below is detailed
error message. The line "require 'active_adaptor'" is failing in
compiler.rb.

/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- active_adaptor
(MissingSourceFile)
from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
from
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in
`require'
from
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in
`new_constants_in'
from
/usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in
`require'
from compiler.rb:11