I guess I was making mistake on app.js
var myApp = angular.module('myApp',[ngPicky]);
myApp.controller('ngPicky', ['$scope', function($scope) {
// defaults
$scope.hue = 0;
$scope.color = Color.create(255, 255, 255);
$scope.selectColor = function(color) {
$scope.color = color;
$scope.pick({
$color: color
});
};
}],