Why do I get a laravel error while creating a new project?

1. You need to update the installer to the latest version.

laravel-news.com/updating-the-laravel-installer

composer global require "laravel/installer:^4.0"

2. after update you check your version using: laravel --version and you should get output like Laravel Installer 4.0.3

Your Laravel installer is very out of date. The only way to get the latest version is to remove and install again:

composer global remove laravel/installer 
composer global require laravel/installer