500 Internal Server error

Sort of new at all this…

I installed Ruby on Rails on my Mac according to the instructions on
HiveLogic’s blog. I can run the server and even create my database
schema automatically. But when I try to open up my results, I end up
getting a 500 Internal Server error on my browser. My Unix terminal
reads the following:

dyld: NSLinkModule() error
dyld: Symbol not found: _rl_filename_completion_function
Referenced from:
/usr/local/lib/ruby/1.8/powerpc-darwin8.5.0/readline.bundle
Expected in: flat namespace

I get the same 500 Internal Server error when I try to get information
about my application’s environment upon clicking on its link on my Rails
home page on localhost:3000.

Is there a fix for this? Or would it be better to blow it out and
reinstall?