我創建了兩個資源控制器，一個用于管理員，另一個用于用戶。我得到的錯誤是，Illuminate\Contracts\Container\BindingResolutionException 目標類 [App\Http\Controllers\ProductsController] 不存在。我的代碼有什么問題？這是我的 Admin\ProductsController.php<?phpnamespace App\Http\Controllers\Admin;use App\Http\Controllers\Controller;use Illuminate\Http\Request;use App\Product;use App\Category;class ProductsController extends Controller{    public function __construct()    {        $this->middleware('auth');    }      public function index()    {        $arr['products'] = Product::all();        return view('admin.products.index')->with($arr);    }         public function create()    {        return view('admin.products.create');    }       public function store(Request $request, Product $product)    {        if($request->prod_image_path->getClientOriginalName())        {            $ext =$request->prod_image_path->getClientOriginalName();            $file = date('YmdHis').rand(1,99999).'.'.$ext;            $request->prod_image_path->storeAs('public/admin',$file);        }else{            $file ='';        }        $product-> prod_name = $request-> prod_name;        $product-> prod_meta_title = $request-> prod_meta_title;        $product-> prod_description = $request-> prod_description;        $product-> prod_category = $request-> prod_category;        $product-> prod_price = $request-> prod_price;        $product-> prod_discount = $request-> prod_discount;        $product-> prod_image_path = $file;               $product->save();        return redirect()->route('admin.products.index');           }