Database plugin problem installing on windows

Thanks in advance for your kindness,

I have a problem with the database plugin. I have installed with success the databse on linux but when I tried to install on windows 2003, I can't access to the database.

I have this problem

No such DB my_db at D:/Foswiki/Foswiki/lib/Foswiki/Plugins/DatabasePlugin.pm line 89. at C:/strawberry/perl/lib/CGI/Carp.pm line 354 CGI::Carp::realdie('No such DB my_db at D:/Foswiki/Foswiki/lib/Foswiki/Plugins/Da...') called at C:/strawberry/perl/lib/CGI/Carp.pm line 439 CGI::Carp::die('No such DB my_db') called at D:/Foswiki/Foswiki/lib/Foswiki/Plugins/DatabasePlugin.pm line 89 eval {...} called at D:/Foswiki/Foswiki/lib/Foswiki/Plugins/DatabasePlugin.pm line 88 Foswiki::Plugins::DatabasePlugin::_dispatch('DATABASE_SQL', ' description="my_db" sql="select 2 from dual"') called at

my_db is well configured on my database plugins.

Someone had the same problem?

Regards