Rails - Nov 2005 - multilingual plugin - rake fails

I''m getting this error running rake test_plugins:

-- create_table("users", {:force=>true})
   -> 0.1209s
-- create_table("users", {:force=>true})
   -> 0.0350s
-- create_table(:multilingual_products, {:force=>true})
/usr/lib/site_ruby/1.8/rubygems/custom_require.rb:21:in `require__'':
no such file to load -- api (MissingSourceFile)


what am I missing? what other packages or libraries does the
multilingual plugin require anyway?