I have been running Ruby on Rails on my laptop for about a month now, but when I wanted to run the server in this instance (and it was working fine a few hours ago) I now re
YAML does not accept TAB characters (\t) for indentation. Look for those in your config/application.yml and replace with 2 spaces.
\t
config/application.yml
(or there may be other syntax errors, as suggested by Ryan. But I'm betting on this one)