Rails and SQLITE3 problem

Question

I am trying to install "ChiliProject" on my Windows XP SP3. Everything was fine until I tried to process the db:migrate.

C:\RubyApps\chiliproject>bundle exec rake db:migrate

Then I get the error:

rake aborted! no such file to load -- sqlite3

I have the sqlite3 gem installed:

sqlite3 (1.3.4 x86-mingw32 x86-mswin32-60)

The three files: sqlite3.exe, sqlite3.dll, sqlite3.def from sqlite.org are put in the "C:\Ruby192\bin" directory (which is my default ruby dir).

The database configuration is (database.yml):

production:
  adapter: sqlite3
  database: db/production.db

What am I doing wrong?