issue while installing composer

[Ammadkhanzai]

Warning: Ambiguous class resolution, "Illuminate\Database\Eloquent\Factory" was found 2x: in "/Users/ammadkhan/Docs/chat-demo-master/vendor/laravel/legacy-factories/src/Factory.php" and "/Users/ammadkhan/Docs/chat-demo-master/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Factory.php", the first will be used.
Warning: Ambiguous class resolution, "Illuminate\Database\Eloquent\FactoryBuilder" was found 2x: in "/Users/ammadkhan/Docs/chat-demo-master/vendor/laravel/legacy-factories/src/FactoryBuilder.php" and "/Users/ammadkhan/Docs/chat-demo-master/vendor/laravel/framework/src/Illuminate/Database/Eloquent/FactoryBuilder.php", the first will be used.
Warning: Ambiguous class resolution, "Illuminate\Support\Traits\Macroable" was found 2x: in "/Users/ammadkhan/Docs/chat-demo-master/vendor/illuminate/macroable/Traits/Macroable.php" and "/Users/ammadkhan/Docs/chat-demo-master/vendor/laravel/framework/src/Illuminate/Support/Traits/Macroable.php", the first will be used.

Illuminate\Foundation\ComposerScripts::postAutoloadDump
@php artisan package:discover --ansi

In PackageManifest.php line 122:

Undefined index: name

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

[Skeiceee]

execute:
composer self-update --1