angular中的service注册

Question

//service代码

var services = angular.module('guthub.services', ['ngResource']);

services.factory('Recipes', ['$resource', function($resource){
 return $resource('/recipes/:id',{id:'@id'}
 );
}]);

//controller代码

app.controller('ListCtrl',['$scope','Recipes',
 function($scope,Recipes){
   $scope.recipes =Recipes;
}]);

//报错信息：Error: [$injector:modulerr] Failed to instantiate module guthub due to: //[$injector:modulerr] Failed to instantiate module guthub.services due to: [$injector:nomod] //Module 'guthub.services' is not available! You either misspelled the module name or forgot to //load it. If registering a module ensure that you specify the dependencies as the second //argument.