Error: Use of undefined constant ENVIRONMENT - CI 4.1.5

Hello,
I am getting this error when I run "spark" to create a migration.

Code:

$ php spark migrate:create create_posts_table
PHP Warning:  Use of undefined constant ENVIRONMENT - assumed 'ENVIRONMENT' (this will throw an Error in a future version of PHP) in vendor/codeigniter4/framework/system/Config/Factories.php on line 110

The migration is created anyway, but I wonder what this is about.

PHP 7.4.3
CI 4.1.5

Thanks