[Rails] rail s exiting

Hello everyone,

I am fairly new to ruby on rails, and I come across this tutorial on
treehouse where they help you make a simple version of facebook.

anyway, I was writing codes, and I came across this error and I am not
sure how to fix it. The error occurs after I type in rail s on the
command prompt and as soon as try to look at how it looks on
127.0.0.1:3000, it gives me this error. the picture is attached since
its a pretty big error.

I checked out config.rb but i wasn't sure what i was looking for.

Attachments:
http://www.ruby-forum.com/attachment/7698/Untitled.png


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