Hello,

Please check your server's php error logs and let me know the error details so that I can suggest.

I have listened that flashdata is not being clear for some users on php8. You can add the lines below in the page_construct method of app/core/MY_Controller.php before $this->load->view lines to manually clear it

$this->session->unset_userdata('error');
$this->session->unset_userdata('message');
$this->session->unset_userdata('warning');

I will need the error details for first and last, I suspect it's due to server requirements that qrcode or barcode is generating the error.

Thank you

Thanks for your reply.
I was using PHP 8, now everything is fine in PHP 6.3.