'"Unable to request pty" PHP - rsync

I want to connect via SSH2 and transfer files with rsync but I get the following error. What could be the reason for this?

$ssh = new SSH2('storage.example.com');
    if (!$ssh->login('username', 'helloWorld')) {
        exit('Login Failed');
    } else {
        echo "asdas";
    }
    $ssh->exec("rsync --progress --rsh='ssh -p23' --recursive /var/.../backups [email protected]:backupsForProjects/april_2022/");
    $output = $ssh->read('#[pP]assword[^:]*:#', SSH2::READ_REGEX);
    if (preg_match('#[pP]assword[^:]*:#', $output)) {
        $ssh->write("HeLLoPaSSwoRD\n");
    }

Error:

Fatal error: Uncaught RuntimeException: Unable to request pty in /var/www/***/web/vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php:3000 Stack trace: #0 /var/www/***/web/vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php(3118): phpseclib3\Net\SSH2->initShell() #1 /var/www/***/web/test2.php(13): phpseclib3\Net\SSH2->read() #2 /var/www/***/web/index.php(118): include('/var/www/client...') #3 {main} thrown in /var/www/***/web/vendor/phpseclib/phpseclib/phpseclib/Net/SSH2.php on line 3000
phprsyncpty


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