Facade does not implement getFacadeAccessor method

Question

I got this error message after trying to downgrade laravel 9 to 8 cause i recently downgraded my php version from 8 to 7.3

In Facade.php line 178:
                                                   
Facade does not implement getFacadeAccessor method.  
                                                   

Script @php artisan package:discover --ansi handling the post-autoload-dump even
returned with error code 1

Answer 1

in config/app.php replace

 'aliases' => Facade::defaultAliases()->merge([ ])->toArray(),

with:

'aliases' => [

        'App' => Illuminate\Support\Facades\App::class,
        'Arr' => Illuminate\Support\Arr::class,
        'Artisan' => Illuminate\Support\Facades\Artisan::class,
        'Auth' => Illuminate\Support\Facades\Auth::class,
        'Blade' => Illuminate\Support\Facades\Blade::class,
        'Broadcast' => Illuminate\Support\Facades\Broadcast::class,
        'Bus' => Illuminate\Support\Facades\Bus::class,
        'Cache' => Illuminate\Support\Facades\Cache::class,
        'Config' => Illuminate\Support\Facades\Config::class,
        'Cookie' => Illuminate\Support\Facades\Cookie::class,
        'Crypt' => Illuminate\Support\Facades\Crypt::class,
        'Date' => Illuminate\Support\Facades\Date::class,
        'DB' => Illuminate\Support\Facades\DB::class,
        'Eloquent' => Illuminate\Database\Eloquent\Model::class,
        'Event' => Illuminate\Support\Facades\Event::class,
        'File' => Illuminate\Support\Facades\File::class,
        'Gate' => Illuminate\Support\Facades\Gate::class,
        'Hash' => Illuminate\Support\Facades\Hash::class,
        'Http' => Illuminate\Support\Facades\Http::class,
        'Js' => Illuminate\Support\Js::class,
        'Lang' => Illuminate\Support\Facades\Lang::class,
        'Log' => Illuminate\Support\Facades\Log::class,
        'Mail' => Illuminate\Support\Facades\Mail::class,
        'Notification' => Illuminate\Support\Facades\Notification::class,
        'Password' => Illuminate\Support\Facades\Password::class,
        'Queue' => Illuminate\Support\Facades\Queue::class,
        'RateLimiter' => Illuminate\Support\Facades\RateLimiter::class,
        'Redirect' => Illuminate\Support\Facades\Redirect::class,
        // 'Redis' => Illuminate\Support\Facades\Redis::class,
        'Request' => Illuminate\Support\Facades\Request::class,
        'Response' => Illuminate\Support\Facades\Response::class,
        'Route' => Illuminate\Support\Facades\Route::class,
        'Schema' => Illuminate\Support\Facades\Schema::class,
        'Session' => Illuminate\Support\Facades\Session::class,
        'Storage' => Illuminate\Support\Facades\Storage::class,
        'Str' => Illuminate\Support\Str::class,
        'URL' => Illuminate\Support\Facades\URL::class,
        'Validator' => Illuminate\Support\Facades\Validator::class,
        'View' => Illuminate\Support\Facades\View::class,
    ],

Answer 2

In my case the error started to appear, after run Laravel Shift to upgrade from 8.x to 9.x, where I've executed composer install instead composer update.

Then, I've deleted the vendor folder and run composer update.

Now everything is fine.