Calling a function in javascript object literal notation declaration

I'm trying to call a function within an object literal that I created, using the this keyword. But an error shows up saying this.doTheMove() is not a function:

window.onload = function(){

  var animBtn = document.getElementById('startAnim');

  animBtn.addEventListener('click', Animation.init, false);

}

var Animation = {
  init: function(){

     this.doTheMove(); // I'm calling the function here, but it gives an error.

  },
  doTheMove: function(){

    alert('Animation!');

  }
}

Why is there an error?