install failed

[三輪晋]

hi.
I can not install teamtrick.
I read past logs, do not support ruby1.9 ?

[ environment ]
Ubuntu 12.04.1 LTS
ruby 1.9.3p0
Rails 3.2.8

[ operation ]
I work as described in the following procedure.
https://github.com/manuelmorales/teamtrick

 % sudo apt-get install ruby rubygems rake libopenssl-ruby

 % git clone git://github.com/manuelmorales/teamtrick.git

I have an error.

 % rake teamtrick:configure
 Invalid gemspec in [/var/lib/gems/1.9.1/specifications/tilt-1.3.3.gemspec]: invalid date format in specification: "2011-08-25 00:00:00.000000000Z"
 Missing the Rails 2.3.14 gem. Please `gem install -v=2.3.14 rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed.

so I have changed config/environment.rb

 RAILS_GEM_VERSION = '2.3.14' unless defined? RAILS_GEM_VERSION

now

 RAILS_GEM_VERSION = '3.2.8' unless defined? RAILS_GEM_VERSION

It still results in an error

 % rake teamtrick:configure
 Invalid gemspec in [/var/lib/gems/1.9.1/specifications/tilt-1.3.3.gemspec]: invalid date format in specification: "2011-08-25 00:00:00.000000000Z"
 Missing the Rails 3.2.8 gem. Please `gem install -v=3.2.8 rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed



Do you have any idea ?