TypeError：无法设置属性＆＃39;突出显示＆＃39;未定义的角度类型

Question

我正在尝试将angular-typeahead添加到我的应用中以获取搜索建议，并从此Plunkr获取帮助。

这是app.js文件的代码：

var myApp = angular.module('myApp', ['ngRoute','siyfion.sfTypeahead']);

myApp.factory('websitesSvc',function($http, $log, $q) {
return {
    getwebsites: function(){

        //Create a promise using promise library
        var deferred = $q.defer();

        $http({method: 'GET', url: '/api/websites/'}).
            success(function(data, status, headers,config){
                deferred.resolve(data);
            }).
            error(function(data, status, headers,config){
                deferred.reject(status);
            });

        return deferred.promise;
    }
};
});

myApp.controller('MyCtrl', ['$scope','websitesSvc','$timeout',
function($scope,websitesSvc,$timeout) {

$scope.searchString=null;


websitesSvc.getwebsites().then(function(websites){
 $scope.websites = websites;
}); 

$timeout(function() {
var websites = new Bloodhound({
datumTokenizer: function(d) { return Bloodhound.tokenizers.whitespace(d.domain_name); },
queryTokenizer: Bloodhound.tokenizers.whitespace,
local:$scope.websites,
});

// initialize the bloodhound suggestion engine
 websites.initialize();

$scope.numbersDataset = {
displayKey: 'domain_name',
 source: websites.ttAdapter()
};

// Typeahead options object
$scope.exampleOptions = {
 highlight: true
}; 
},1000);

 }
]);

添加延迟以便首先执行服务，然后可以将获取的数据传递给typeahead以获取搜索建议。但是我在控制台中收到以下错误。 我该如何更改我的代码来调试它？