Redmine

I am very new with Redmine, I am facing problem installing it. Here is all detail about installation.

*** LOCAL GEMS ***

actionmailer (3.2.1, 2.3.14)
actionpack (3.2.1, 2.3.14)
activemodel (3.2.1)
activerecord (3.2.1, 2.3.14)
activeresource (3.2.1, 2.3.14)
activesupport (3.2.1, 2.3.14)
arel (3.0.0)
builder (3.0.0)
cgi_multipart_eof_fix (2.5.0)
erubis (2.7.0)
gem_plugin (0.2.3)
hike (1.2.1)
i18n (0.6.0)
journey (1.0.1)
mail (2.4.1)
mime-types (1.17.2)
mongrel (1.1.5 x86-mingw32)
mongrel_service (0.3.4 i386-mswin32)
multi_json (1.0.4)
mysql (2.8.1 x86-mingw32)
polyglot (0.3.3)
rack (1.4.1, 1.1.3)
rack-cache (1.1)
rack-ssl (1.3.2)
rack-test (0.6.1)
rails (2.3.14)
rake (0.9.2.2)
sprockets (2.1.2)
thor (0.14.6)
tilt (1.3.3)
treetop (1.4.10)
tzinfo (0.3.31)
win32-service (0.5.2 mswin32)

Error I am facing is here..

C:\......>rake generate_session_store
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from C:/xampp/htdocs/Redmine/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:21.
rake aborted!
uninitialized constant Gem::SyckDefaultKey

(See full trace by running task with --trace)

More Information about versions:

ruby 1.8.7 (2011-12-28 patchlevel 357) [i386-mingw32]
gem 1.8.12
rake-0.9.2.2.gem
rails-2.3.14.gem
Successfully installed i18n-0.6.0
mongrel-1.1.5-x86-mingw32.gem
Successfully installed win32-service-0.5.2-x86-mswin32
Successfully installed mongrel_service-0.3.4-x86-mswin32