Yii2: Application can't be executed. Apache shows "Index of"

I developed a Yii2 application that works in my computer with Debian.

Then I installed Bitnami WAPP in a computer with Windows 8 and I tried to execute it but it doesn’t work. It shows the content like a folder instead of execute the code:

I thought that Apache was having a problem and it can’t execute PHP, so I tried to execute a basic example and it works perfect:

<?php 
  phpinfo(); 
?>

UPDATE: I think the problem was a wrong address. But now it shows this error:

I hope all this information can help.

Apache log:

[Thu Jul 12 08:22:35.576377 2018] [php7:warn] [pid 5100:tid 1004] [client ::1:56103] PHP Warning:  require(C:\Bitnami\wappstack-7.1.19-0\apache2\htdocs\donaciones-yii\backend\web/../../vendor/autoload.php): failed to open stream: No such file or directory in C:\Bitnami\wappstack-7.1.19-0\apache2\htdocs\donaciones-yii\backend\web\index.php on line 5
[Thu Jul 12 08:22:35.576377 2018] [php7:error] [pid 5100:tid 1004] [client ::1:56103] PHP Fatal error:  require(): Failed opening required 'C:\Bitnami\wappstack-7.1.19-0\apache2\htdocs\donaciones-yii\backend\web/../../vendor/autoload.php' (include_path='.;C:/Bitnami/wappstack-7.1.19-0/php/PEAR') in C:\Bitnami\wappstack-7.1.19-0\apache2\htdocs\donaciones-yii\backend\web\index.php on line 5

Apache access.log:

::1 - - [12/Jul/2018:08:22:35 -0300] "GET /donaciones-yii/backend/web/ HTTP/1.1" 500 -

donaciones-yii/backend/web/index.php:

<?php
defined('YII_DEBUG') or define('YII_DEBUG', false);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/../../vendor/autoload.php');
require(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/../../common/config/bootstrap.php');
require(__DIR__ . '/../config/bootstrap.php');

$config = yiihelpersArrayHelper::merge(
    require(__DIR__ . '/../../common/config/main.php'),
    require(__DIR__ . '/../../common/config/main-local.php'),
    require(__DIR__ . '/../config/main.php'),
    require(__DIR__ . '/../config/main-local.php')
);

(new yiiwebApplication($config))->run();