Rails server does not start due to the error I got last time

I'm using rails on vagrant to create an application. In the app, I was playing around with open-uri, and it did not work so I stopped the server. Then, I keep getting the following error when I try to run my server or even rails console. /rbenv/versions/2.2.2/lib/ruby/2.2.0/open-uri.rb:358:in `open_http': 503 Service Unavailable (OpenURI::HTTPError)

My guess is that some old files exist and they are causing the errors, but I'm not sure what to do.

I'd appreciate it if someone could help me out.

Thanks.