Composer install fails because Media::$casts must be array

[kirkaracha]

Trying to install in Laravel 8.39.0 fails because Media::$casts must be array.

composer require "spatie/laravel-medialibrary:^9.0.0"

Type of Spatie\MediaLibrary\MediaCollections\Models\Media::$casts must be array (as in class Illuminate\Database\Eloquent\Model)

  at vendor/spatie/laravel-medialibrary/src/MediaCollections/Models/Media.php:31
     27▕ use Spatie\MediaLibrary\Support\TemporaryDirectory;
     28▕ use Spatie\MediaLibrary\Support\UrlGenerator\UrlGeneratorFactory;
     29▕ use Spatie\MediaLibraryPro\Models\TemporaryUpload;
     30▕
  ➜  31▕ class Media extends Model implements Responsable, Htmlable
     32▕ {
     33▕     use IsSorted,
     34▕         CustomMediaProperties,
     35▕         HasUuid;


   Whoops\Exception\ErrorException

  Type of Spatie\MediaLibrary\MediaCollections\Models\Media::$casts must be array (as in class Illuminate\Database\Eloquent\Model)

  at vendor/spatie/laravel-medialibrary/src/MediaCollections/Models/Media.php:31
     27▕ use Spatie\MediaLibrary\Support\TemporaryDirectory;
     28▕ use Spatie\MediaLibrary\Support\UrlGenerator\UrlGeneratorFactory;
     29▕ use Spatie\MediaLibraryPro\Models\TemporaryUpload;
     30▕
  ➜  31▕ class Media extends Model implements Responsable, Htmlable
     32▕ {
     33▕     use IsSorted,
     34▕         CustomMediaProperties,
     35▕         HasUuid;

      +1 vendor frames
  2   [internal]:0
      Whoops\Run::handleShutdown()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 255

Installation failed, reverting ./composer.json and ./composer.lock to their original content.

[muhghazaliakbar]

Same issue here.