Why did cron break after connecting the vendor and use?

Question

PHP

Tell me, why did the cron break after connecting the vendor and use? In the sense it stopped working

Namely, after adding these lines:

require '/var/www/project/vendor/autoload.php';

use Aws\Ses\SesClient;
use Aws\Exception\AwsException;

Answer 1

Turn on error output in PHP and you need to debug what error occurs.
I assume that Aws\Ses\SesClient and Aws\Exception\AwsException are not found, are these your classes/interfaces/traits self-written?
Try setting up composer.json and run the command:
$ php composer.phar dump-autoload -o
To make the autoloader pick up your classes