PHP Fatal error: Uncaught Error: Class ‘BracketSpace\Notification\Utils\Require

Hi,

When doing a cronjob with a (non-related) wp-cli command, I get the following error:

PHP Fatal error:  Uncaught Error: Class 'BracketSpace\Notification\Utils\Requirements' not found

This looks pretty similar like the error explained in:
https://wordpress.org/support/topic/fatal-error-uncaught-error-class-underdev_requirements/.

And when I add __DIR__ to load the autoload.php, no error is thrown.

Is it possible to add require_once __DIR__ .'/vendor/autoload.php'; to notification.php plugin?

Thanks!

Edwin