Problem with Login page, redirect

Question

It works well, does not let pass the credentials that are not configured. But when redirecting it to the other, does not work.

session_start();

if (!empty($_POST)) {
    $isim = $_POST['login'];
    $sifre = $_POST['password'];

    var_dump($isim, $sifre);

    if($isim == 'teste' && password_verify($sifre, '$2y$10$OvT4fn4/S7cF2O4Rgr1hK.lhz0lKPaaEuyO/Bxn23HA7lFQEsCLoy')) {
        $_SESSION['auth'] = 1;

        header('Location: main.php');
        exit;
    }
}

After that she should redirect me to the page "main.php", but what appears is a blank screen.

If you want to access to observe:

username: test

password: test

https://raindroipstexter.000webhostapp.com/panel/login.php

I put this code, now I get other deleted errors.

error_reporting(E_ALL); ini_set('display_errors', 'On');