* hello, i have problem with my Rackfile. When i try `rake db:migrate` i get error -> `NoMethodError: undefined method 'to_sym' for nil:NilClass`
`CONFIG[:database]` is declarated

```
namespace :db do
  desc 'Run migrations'
  task :migrate, [:version] do |_t, args|
    require 'sequel'
    
    Sequel.extension :migration

     # this puts OK
     puts "before"

    db = Sequel.connect(CONFIG[:database])

    # puts not execute
    puts "atfer"
    
  end
end
```

its problem with `db = Sequel.connect(CONFIG[:database])` but i dont have idea what is going on..