List your current Ruby and Rails versions (i.e. the versions you are
Check to ensure that you have all your gems configured properly and
perform a rake gems install to see if they are all installed properly.
Keep in mind that in production you are using RAILS_ENV=production rake
Start with the simplest things first.
What are you using with Rails, mongrel or passenger?
There are a lot of ways to handle this - I'd start with the patient one.