How to fix Yii2: An internal server error occurred?

Question

Yii

After structuring Yii2 and setting up index files, the error "An internal server error occurred" appears. but if the index is not configured correctly, swap the frontend and backend, everything works.
Example admin/index:
<?php
defined('YII_DEBUG') or define('YII_DEBUG', false);
defined('YII_ENV') or define('YII_ENV', 'prod');
require __DIR__ . '/../../yii/vendor/autoload.php';
require __DIR__ . '/../../yii/vendor/yiisoft/yii2/Yii.php';
require __DIR__ . '/../../yii/common/config/bootstrap.php';
require __DIR__ . '/../../yii/ frontend /config/bootstrap.php';
$config = yii\helpers\ArrayHelper::
require __DIR__ . '/../../yii/common/config/main-local.php',
require __DIR__ . '/../../yii/ frontend /config/main.php',
require __DIR__ . '/../../yii/ frontend /config/main-local.php'
);
(new yii\web\Application($config))->run();

Answer 1

Goodnight.
Replace false with true and prod with dev. It also helps to read the logs.

defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');