Rails server doesn't work properly

Everything was ok, until suddenly when I do a “rails server”, I get this
output: http://pastie.org/6603101.

This happened also on some applications before, suddenly.

I’m using RVM and I’m inside the apps root folder. I’m also using*

$ ruby -v => ruby 2.0.0p0 (2013-02-24 revision 39474)
$ rails -v => Rails 4.0.0.beta1
$ which rails => /Users/xxxx/.rvm/gems/ruby-2.0.0-p0/bin/rails

Gemfile: http://pastie.org/6603419

PS: Also tried bundle exec rails server, same thing.

Forgot! These are my .bash_profile & .profile files (I’m on Mountain
Lion): http://pastie.org/6603536