こんばんは。konnです。

ActiveRecordからSQLiteにアクセスしようとするとエラーが出てしまいます。
以下のようにしました。

$ sqlite db
SQLite version 2.8.15
Enter ".help" for instructions
sqlite> create table testes(
   ...> id int unsigned not null,
   ...> name text,
   ...> primary key (id)
   ...> );
sqlite> .q
$ irb
irb(main):001:0> require "rubygems"
=> true
irb(main):002:0> require_gem "activerecord"
=> true
irb(main):003:0> ActiveRecord::Base.establish_connection(
irb(main):004:1* :adapter => "sqlite",
irb(main):005:1* :dbfile => "db"
irb(main):006:1> )
=> #<ActiveRecord::Base::ConnectionSpecification:0x7176c8
@adapter_method="sqlite_connection", @config={:dbfile=>"db",
:adapter=>"sqlite"}>
irb(main):007:0> class Tests < ActiveRecord::Base; end
irb(main):008:0> Tests.find_all()
NoMethodError: undefined method `show_datatypes=' for
#<SQLite::Database:0x70953c>
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/conn
ection_adapters/sqlite_adapter.rb:34:in `sqlite_connection'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/conn
ection_adapters/abstract_adapter.rb:136:in `send'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/conn
ection_adapters/abstract_adapter.rb:136:in `connection='
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/conn
ection_adapters/abstract_adapter.rb:100:in `retrieve_connection'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/base
.rb:235:in `connection'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/base
.rb:366:in `find_by_sql'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/base
.rb:334:in `find'
        from 
/usr/local/lib/ruby/gems/1.9/gems/activerecord-1.10.1/lib/active_record/depr
ecated_finders.rb:37:in `find_all'
        from (irb):8


どうすればいいのでしょうか?どなたかお教え下さい。
環境は、MacOSX10.4.1 + SQLite2.8.15 + ruby 1.9.0 (2005-05-01)
[powerpc-darwin8.0.0]です。

---
☆★konn★☆
Good bye...
---