rake migrations with namespace (prefix)

I have access to a shared database. So, I wanted to create my application tables with a prefix "cmro_". So, I did this: 1. I edited config/environment.rb and added this line: config.active_record.table_name_prefix = 'cmro_' 2. I ran rake db:migrate. But I kept getting errors (pasted below). Any suggestions on how to fix these? 3. I am also not sure how to clean the database again. Is there some sort of rake db:destroy to clean-up all the tables that rake created?

*************FIRST ATTEMPT************ bash-3.00$ rake db:migrate (in /work/storage/ror1-workdir/cmro) == CreateTemplates: migrating