Fail to start a lower Version ( Rails 1.1.6) Rails Project

I have a RoR project in rails version 1.1.6.
Just to start this project i just install rails of version 1.1.6

but when i am going to start to start the server then i got the
following error..

D:\simpleticket>ruby script/server
./script/../config/boot.rb:25:Warning: Gem::SourceIndex#search support
for Strin
g patterns is deprecated
./script/../config/boot.rb:28: undefined method `require_gem' for
main:Object (N
        from D:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
31:in `ge
        from D:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
31:in `re
        from script/server:2

So, At this Present How can i able to start this lower version
Please Help me...

Thanking You

You're rails app doesn't like the version of rubygems you have
installed ( require_gem was deprecated and then replaced with gem). It
may be enough to replace occurrences of require_gem with gem