[Rails] rake aborted!

[Aashish Kiran]

---------rakefile-------------

require 'csv'
require 'rake'
task :purchaseAlcohol do
  puts "Purchased Vodka"
end

task :mixDrink do
  puts "Mixed Fuzzy Navel"
end

task :getSmashed do
  puts "Dood, everthing’s blurry, can I halff noth’r drinnnk?"
end
-----------end--------------------

when I run rake task using any of the commands

rake purchaseAlcohol
rake mixDrink
rake getSmashed

i am getting error as
rake aborted! Don't know how to build task 'taskname'
Can anyone please tell how to get rid of it.
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