CI4 in localhost

I just tried, but nothing as changed, always the same message.

But I remember seeing this part of the message in a file :
systemDirectory, '/ ') . '/bootstrap.php';

Yeah, in the var/www/html/ci-install/public/index.php, there is a line  :
$app = require rtrim($paths->systemDirectory, '/ ') . '/bootstrap.php';

I don't understand why part of this script appeared on a web page
Do you have an idea ?