[ActiveRecord with Rails] sqlite3-ruby installed, but can't find Init_sqlite3

Hi all,

platform: win32

I try to use rails with a sqlite3 backend, but I have got an error
with rake db:migrate.
It seems that can not find the Init_sqlite3.

the sqlite3-ruby(win32) gem is installed in the gem repository.

If I use AR without Rails, I do not have problems, but if I want to
use rails, "rake db:migrate" can not load Init_sqlite3.

the sqlite3.dll is in vendor directory, and in the past I have never
seen this bug :frowning:

Version:
Rails => 1.2.3
Ruby : 1.8.6
sqlite3-ruby : 1.2.1 (win32)

RUBYOPT=-rubygems

Thanks