[hagure]

I'm on Leopard 10.5.2 with Dev Tools installed, but when I try "ruby script/server", I get this in Terminal

./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext/hash.rb:2:in `require': no such file to load -- ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access (LoadError)
	from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext/hash.rb:2
	from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext.rb:1:in `require'
	from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext.rb:1
	from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext.rb:1:in `each'
	from ./script/../config/../vendor/rails/activesupport/lib/active_support/core_ext.rb:1
	from ./script/../config/../vendor/rails/activesupport/lib/active_support.rb:31:in `require'
	from ./script/../config/../vendor/rails/activesupport/lib/active_support.rb:31
	from ./script/../config/../vendor/rails/railties/lib/commands/server.rb:1:in `require'
	from ./script/../config/../vendor/rails/railties/lib/commands/server.rb:1
	from script/server:3:in `require'
	from script/server:3

Is there anything I have to install beforehand?