Ruby on Rails

i'm working on ubuntu 11.04; i need to create some rails application
with oracle database on local computer.
i installed: ruby 1.9.2, rails 3.1, oracle 10g XE, rubu-oci8 2.0.6,
gem 'activerecord-oracle_enhanced-adapter', create database user named
'orak' with password 'orakpass' through 127.0.0.1:8080/apex, i maked
new application 'orak' with database.yml parameters
development:
adapter: oracle_enhanced
database: 127.0.0.1/orak
username: orak
password: oraclepass
test:
adapter: oracle_enhanced
database: 127.0.0.1/orak
username: orak
password: oraclepass
production:
adapter: oracle_enhanced
database: 127.0.0.1/orak
username: orak
password: oraclepass
next i'm doing simple scaffold, and trying to rake db:create
result:
rake db:create
Please provide the SYSTEM password for your oracle installation
>oraclepass
rake aborted!
ORA-12514: TNS:listener does not currently know of service requested
in connect descriptor
Tasks: TOP => db:create
(See full trace by running task with --trace)
but I can connect with sqlplus orak/oraclepass@127.0.0.1
i had not work with oracle before, i had search with the google hard
and not found answer.
what i'm doing wrong?

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