What does the error mean when running a YII2 template?

Question

Yii

I decided to use the application template for YII2 advanced ( Here is the template ), but when I try to view the start page, an error occurs

Warning: require(C:\Users\AnarCom\Desktop\OSPanel\domains\yii2-core\frontend\web/../../vendor/autoload.php): failed to open stream: No such file or directory in C :\Users\AnarCom\Desktop\OSPanel\domains\yii2-core\frontend\web\index.php on line 7
Fatal error: require(): Failed opening required 'C:\Users\AnarCom\Desktop\OSPanel\domains\ yii2-core\frontend\web/../../vendor/autoload.php' (include_path='.;c:/users/anarcom/desktop/ospanel/modules/php/PHP-7.1;c:/users/ anarcom/desktop/ospanel/modules/php/PHP-7.1/PEAR/pear') in C:\Users\AnarCom\Desktop\OSPanel\domains\yii2-core\frontend\web\index.php on line 7

(line 1-13 of the file, frontend\web\index.php):

<?php

use yii\helpers\ArrayHelper;
use yii\web\Application;

// Composer
require __DIR__ . '/../../vendor/autoload.php';

// Environment
require __DIR__ . '/../../common/env.php';

// Yii2
require __DIR__ . '/../../vendor/yiisoft/yii2/Yii.php';

And in fact, the question is: How can this error be corrected ?, because there is an error, and attempts to correct it did not lead to any result

Answer 1

Everything turned out to be simpler - the error meant that the pear
manual was not installed on the server