Captcha installation

I am running XP. Downloaded simple captch from expressica, unzipped into
vendor/plugin. Ran

rake simple_captcha:setup.
Gives me error: rake aborted! don’t know how to build task ‘simple
captcha:setup_old’
I checked rails version by
gem list rails
Gives me rails <2.3.5, 1,2,2>
can someone tell me how to fix this?

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