nodeJS jake file Hello World Program Not working

I have a simple hello world jake file, which gives an error:

victors-macbook-pro:votefor Victor$ jake -f jakefile asynchronous

(in /Users/Victor/Documents/workspace/votefor/votefor) Error on line 1 of file [unknown] ReferenceError: Can't find variable: desc

victors-macbook-pro:votefor Victor$ cat jakefile

desc('This is an asynchronous task.');
task('asynchronous', [], function () {
      setTimeout(function () {
          console.log("Yay, I'm asynchronous!");
          complete();
    }, 1000);
}, true);

Is there anything that i am doing wrong ?

The code was copied and pasted from http://howtonode.org/intro-to-jake