Mysql-Ruby required?

I have installed Ruby on Rails on my Linux server
and I am trying to run an application that I created
and I keep getting error:
No database specified. Missing argument: database.

I am sure the configuration on database.yml is correct
and the database does exist. (or maybe I missed something)

My question is, do I need to have mysql-ruby installed?

hi henry

maybe you didn t compile the activerecord drivers for mysql?