laravelでphp artisan serveを入力した際に下記のエラーが発生する場合

01 Sep 2021 on 開発

OS環境：MacOS
laravel Version: laravel 8

laravelでphp artisan serveを入力した際に下記のエラーが発生しました！

$php artisan serve
Warning: require(/Users/jinyoungkim/recipe-osusume/recipe-osusume/recipe-osusume/vendor/autoload.php): failed to open stream: No such file or directory in /Users/jinyoungkim/recipe-osusume/recipe-osusume/recipe-osusume/artisan on line 18

Fatal error: require(): Failed opening required '/Users/jinyoungkim/recipe-osusume/recipe-osusume/recipe-osusume/vendor/autoload.php' (include_path='.:/usr/local/Cellar/php@7.4/7.4.23/share/php@7.4/pear') in /Users/jinyoungkim/recipe-osusume/recipe-osusume/recipe-osusume/artisan on line 18

projectのcomposer updateがされてない時、上記のエラーが発生します。

　　

laravelでphp artisan serveを入力した際に下記のエラー解決

$composer update

上記のコマンドを入力すると正常にできます。