After I installed the right XAMPP (I installed XAMPP -VM before). I tried to run php artisan serve, this is what I get
PHP Parse error: syntax error, unexpected '?' in /Users/nelz/Lara53/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 233
Parse error: syntax error, unexpected '?' in /Users/nelz/Lara53/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php on line 233
And now my Laravel project is not running on serve.