issue installing the library

[Fredericld]

Hi,

I just tried to install the library but the installation failed
I first tried to install the latest version

composer require "spatie/laravel-medialibrary"       
Using version ^9.4 for spatie/laravel-medialibrary
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 5 installs, 2 updates, 0 removals
  - Updating intervention/imagecache (2.5.0 => 2.5.1): Downloading (100%)
  - Updating maximebf/debugbar (v1.16.3 => v1.16.4): Downloading (100%)
  - Installing spatie/temporary-directory (1.3.0): Downloading (100%)
  - Installing spatie/image-optimizer (1.3.2): Downloading (100%)
  - Installing league/glide (1.7.0): Downloading (100%)
  - Installing spatie/image (1.10.1): Downloading (100%)
  - Installing spatie/laravel-medialibrary (9.4.0): Downloading (100%)
spatie/laravel-medialibrary suggests installing league/flysystem-aws-s3-v3 (Required to use AWS S3 file storage)
spatie/laravel-medialibrary suggests installing php-ffmpeg/php-ffmpeg (Required for generating video thumbnails)
spatie/laravel-medialibrary suggests installing spatie/pdf-to-image (Required for generating thumbsnails of PDFs and SVGs)
Writing lock file
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

   Error

  Class name must be a valid object or a string

  at E:\mysite\vendor\spatie\laravel-medialibrary\src\MediaLibraryServiceProvider.php:23
     19▕         $this->registerPublishables();
     20▕
     21▕         $mediaClass = config('media-library.media_model');
     22▕
  ➜  23▕         $mediaClass::observe(new MediaObserver());
     24▕
     25▕         $this->loadViewsFrom(__DIR__.'/../resources/views', 'media-library');
     26▕     }
     27▕

  1   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:36
      Spatie\MediaLibrary\MediaLibraryServiceProvider::boot()

  2   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\Util.php:40
      Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

Installation failed, reverting ./composer.json to its original content.

I then tried to install version 9.0.0
Same error

composer require "spatie/laravel-medialibrary:^9.0.0"
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 1 update, 0 removals
  - Downgrading spatie/laravel-medialibrary (9.4.0 => 9.0.0): Downloading (100%)
Writing lock file
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

   Error
  Class name must be a valid object or a string

  at E:\mysite\vendor\spatie\laravel-medialibrary\src\MediaLibraryServiceProvider.php:23
     19▕         $this->registerPublishables();
     20▕
     21▕         $mediaClass = config('media-library.media_model');
     22▕
  ➜  23▕         $mediaClass::observe(new MediaObserver());
     24▕
     25▕         $this->loadViewsFrom(__DIR__.'/../resources/views', 'media-library');
     26▕     }
     27▕

  1   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:36
      Spatie\MediaLibrary\MediaLibraryServiceProvider::boot()

  2   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\Util.php:40
      Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

Installation failed, reverting ./composer.json to its original content.

The library is in composer.json so I tried to run

composer dumpautoload
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

   Error

  Class name must be a valid object or a string

  at E:\mysite\vendor\spatie\laravel-medialibrary\src\MediaLibraryServiceProvider.php:23
     19▕         $this->registerPublishables();
     20▕
     21▕         $mediaClass = config('media-library.media_model');
     22▕
  ➜  23▕         $mediaClass::observe(new MediaObserver());
     24▕
     25▕         $this->loadViewsFrom(__DIR__.'/../resources/views', 'media-library');
     26▕     }
     27▕

  1   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:36
      Spatie\MediaLibrary\MediaLibraryServiceProvider::boot()

  2   E:\mysite\vendor\laravel\framework\src\Illuminate\Container\Util.php:40
      Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

I do not know what the issue is... Is version 9 stable? or is version 8 prefered?

[Fredericld]

Clearing the cache fixed the issue