Erro ao retornas Cursos

Erro:

Undefined array key "App\Models\Course"

Model:

class Course extends Model

{

    use HasFactory, UuidTrait;

      protected $fillable = [

        'name',

        'description',

        'image',

    ];

}

Controller:

class CourseController extends Controller

{

   public function index(){

    $courses = Course::all();

    return CourseResource::collection($courses);

   }

}

Resource:

class CourseResource extends JsonResource

{

    /**

     * Transform the resource into an array.

     *

     * @param  \Illuminate\Http\Request  $request

     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable

     */

    public function toArray($request)

    {

        return [

            'id'          => $this->id,

            'name'        => $this->name,

            'description' => $this->description,

            'image'       => $this->image ? Storage::url($this->image) : ''

        ];

    }

    api:

    Route::get('/courses',[CourseController::class, 'index']);