warning: getc is obsolete; use STDIN.getc instead

I'm having a problem with my rails application. When I type

script/server

I get the following error:

/Users/开发者_如何学JAVAadmin/.gem/ruby/1.8/gems/activesupport-2.3.5/
lib/active_support/multibyte/unicode_database.rb:37: 
warning: getc is obsolete; use STDIN.getc instead

This causes the application to hang and not respond.

How can I resolve this?

(I'm using Rails 2.3.5, Gems 1.3.6, Ruby 1.8.7 (2010-01-10 patchlevel 249) [i686-darwin9] on a Mac OS 10.5)

I updated Ruby to

ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-darwin9]

and the problem has not occurred since.