致命错误: Class 'think\Facade\Route' not found

// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
use think\Facade\Route;
define('ADMIN_MODULE', ADMIN_DIR);
$adminList = scandir(__DIR__ . '/../application/admin/controller');
$filterMethods = ['initialize', 'getSide', 'clearCache', '__construct', 'registerMiddleware', '__debugInfo'];
Route::rule(ADMIN_MODULE . '$','admin/index/index');
foreach ($adminList as $v){
    if(!in_array($v, ['.', '..']) && strpos($v, 'back') === false){
        $v = str_replace('.php', '', $v);
        $ll = get_class_methods('\th\admin\controller\\'.$v);
        foreach ($ll as $vv){
            Route::rule(ADMIN_MODULE . '/'.$v.'/' . $vv, 'admin/'.$v.'/' . $vv);
        }
    }
}