當我做這個php artisan route:cache對我來說，這個錯誤出現了。！ 我怎么解決這個問題？  LogicException   Unable to prepare route [api/user] for serialization. Uses Closure.  at C:\wamp64\www\web\vendor\laravel\framework\src\Illuminate\Routing\Route.php:1140    1136|      */    1137|     public function prepareForSerialization()    1138|     {    1139|         if ($this->action['uses'] instanceof Closure) {  > 1140|             throw new LogicException("Unable to prepare route [{$this->uri}] for serialization. Uses Closure.");    1141|         }    1142|     1143|         $this->compileRoute();    1144|   1   C:\wamp64\www\web\vendor\laravel\framework\src\Illuminate\Foundation\Console\RouteCacheCommand.php:62      Illuminate\Routing\Route::prepareForSerialization()  2   C:\wamp64\www\web\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:33      Illuminate\Foundation\Console\RouteCacheCommand::handle()