我正在嘗試安裝該程序包，以幫助管理我在應用程序中的角色和權限。我一直遇到以下問題。根據文檔，要安裝 ，請運行此命令spatie/laravel-permissionLaravel permissioncomposer require spatie/laravel-permission但是，當我這樣做時，我收到此錯誤：> @php artisan package:discover --ansi   ErrorException  : Trying to access array offset on value of type null  at /home/anto/encomm/projects/vendor/spatie/laravel-permission/src/PermissionServiceProvider.php:61    57|     protected function registerModelBindings()    58|     {    59|         $config = $this->app->config['permission.models'];    60|   > 61|         $this->app->bind(PermissionContract::class, $config['permission']);    62|         $this->app->bind(RoleContract::class, $config['role']);    63|     }    64|     65|     protected function registerBladeExtensions()  Exception trace:  1   Illuminate\Foundation\Bootstrap\HandleExceptions::handleError()      /home/anto/encomm/projects/vendor/spatie/laravel-permission/src/PermissionServiceProvider.php:61  2   Spatie\Permission\PermissionServiceProvider::registerModelBindings()      /home/anto/encomm/projects/vendor/spatie/laravel-permission/src/PermissionServiceProvider.php:36  Please use the argument -v to see more details.Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1Installation failed, reverting ./composer.json to its original content.以下是我的文件的內容：composer.json    "name": "laravel/laravel",    "type": "project",    "description": "The Laravel Framework.",    "keywords": [        "framework",        "laravel"    ],    "license": "MIT",    "require": {        "php": "^7.4",        "fideloper/proxy": "^4.0",        "laravel/framework": "^6.2",        "laravel/passport": "^8.2",        "laravel/tinker": "^2.0",        "laravel/ui": "^1.1",        "owen-it/laravel-auditing": "^9.3",        "sudiptpa/guid": "^1.0",        "unisharp/laravel-filemanager": "^2.0"    },