Error: $injector:unpr Unknown Provider

Bonjour

J'ai l'erreur
Error: [$injector:unpr] http://errors.angularjs.org/1.2.14/$injector/unpr?p0=%24resourceProvider%20%3C-%20%24resource%20%3C-%20UserService2
at angular.js:36

Mais mon UserService2 me semble bien defini ?
Ou est mon erreur ?

Code:

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<!DOCTYPE html>
<html>
<head>
    <title>Auto Complete Test</title>
    <link rel="stylesheet" type="text/css" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.14/angular.min.js"></script>
    <script type="text/javascript">
        var app = angular.module('mainApp', []);
                
                
<!--    http://localhost:8080/RESTfulExample05/select3.html -->
 
        
        // Factory
  app.factory('UserService2', function($resource) {
  return $resource('http://localhost:8080/RESTfulExample05/library/getallbook', {}, {
    query2: {
      method: 'GET',
      transformResponse: function(data) {
        return angular.fromJson(data).book;
      },
      isArray: true
    }
  });
});
 
        // Controller
        app.controller('search2Controller', function($scope, UserService2){
    $scope.search2 = {'book': []};
                        
        UserService2.query2().$promise.then(function(data) {
                $scope.search2 = data;
                $scope.isArray = data instanceof Array;
        });
 });
    </script>
</head>
<body ng-app="mainApp">
 
<br>
 
 
 
    <div ng-controller="search2Controller">
 
		<br>
		Avec le Nom
		<br>
 
 
 
		<select ng-model="selectedCar2" 
        ng-options="product as product.isbn for product in search2.book">           
</select>
 
 
 
 
 
<h2>Model: {{selectedCar2.title}}</h2>
 
    </div>
</body>
</html>

Merci