my rake is broken!

broken 'rake'

:~/Desktop/grigio-rails3-ujs-demo-eb6cb9b :: rake db:migrate
/usr/local/lib/ruby/site_ruby/1.9.1/rubygems.rb:370:in `bin_path': can't find gem rake ([">= 0"]) with executable rake (Gem::GemNotFoundException)
	from /usr/local/bin/rake:19:in `<main>'

:~/Desktop/grigio-rails3-ujs-demo-eb6cb9b :: which rake
/usr/local/bin/rake

#Listed as a LOCAL GEM: rake (0.8.7)

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FIXED by editing my 'rake.gemspec' file as shown below:

# rake.gemspec remains just for compatibility with installation
# before Ruby 1.9.2-p32.
# This file will no longer exist in Ruby 1.9.3.
# Refer rake-0.8.7.gemspec instead.
Gem::Specification.new do |s|
  s.name = "rake"
  s.version = "0.8.7"
  s.summary = "This rake is bundled with Ruby"
  s.default_executable = “rake”
  s.executables = ["rake"]
end

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Also, worth mentioning that some people have had luck with deleting the rake.gemspec file altogether