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Q: 

Installing Rake: invalid gem format

I installed Ruby on WinXP. Used rubyinstaller-1.8.6-p383-rc1.exe.

Ran gem install rake

Get error:

Error installing rake: invalid gem format for C:/Ruby/lib/ruby/gems/1.8/cache/rake-0.8.7.gem

I've tried deleting the cache folder but i keep getting the same error. Tried with Ruby 1.9.1 too. Same error. What am i doing wrong?

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