Yii2 ReflectionException Class cebe\markdown\Markdown does not exist - yii

Question

I try to make sample from from Web Application Development with Yii 2 and PHP by Mark Safronov, Jeffrey Winesett.
I've got an error at page http://mysite.local/site/docs
ReflectionException
Class cebe\markdown\Markdown does not exist
1. in C:\Server\domains\crmapp\vendor\yiisoft\yii2\di\Container.php
But the file vendor\cebe\markdown\Markdown.php exists.
Could you please help me to solve this problem.
my config\web.php is
<?php
return [
'id' => 'crmapp',
'basePath' => realpath (__DIR__ . '/../'),
'components' => [
'request' => [
'cookieValidationKey' => 'wtRTWE4RW#4&Fdsa#',
],
'db' => require(__DIR__ . '/db.php'),
'urlManager' => [
'enablePrettyUrl' => true,
'showScriptName' => false,
],
'view' => [
'renderers' => [
'md' => [
'class' => 'app\utilities\MarkdownRenderer'
]
],
],
],
'extensions' => require(__DIR__ . '/../vendor/yiisoft/extensions.php')
];
utilities\MarkdownRenderer.php is
<?php
namespace app\utilities;
use yii\helpers\Markdown;
use yii\base\ViewRenderer;
class MarkdownRenderer extends ViewRenderer
{
public function render($view, $file, $params)
{
return Markdown::process(file_get_contents($file));
}
}
controllers\SiteController.php
<?php
namespace app\controllers;
use \yii\web\Controller;
class SiteController extends Controller
{
public function actionIndex()
{
return 'Our CRM';
}
public function actionDocs()
{
return $this->render('docindex.md');
}
}
vendor\yiisoft\yii2\composer.json is
{
"name": "yiisoft/yii2",
"description": "Yii PHP Framework Version 2",
"keywords": [
"yii2",
"framework"
],
"homepage": "http://www.yiiframework.com/",
"type": "library",
"license": "BSD-3-Clause",
"authors": [
{
"name": "Qiang Xue",
"email": "qiang.xue#gmail.com",
"homepage": "http://www.yiiframework.com/",
"role": "Founder and project lead"
},
{
"name": "Alexander Makarov",
"email": "sam#rmcreative.ru",
"homepage": "http://rmcreative.ru/",
"role": "Core framework development"
},
{
"name": "Maurizio Domba",
"homepage": "http://mdomba.info/",
"role": "Core framework development"
},
{
"name": "Carsten Brandt",
"email": "mail#cebe.cc",
"homepage": "http://cebe.cc/",
"role": "Core framework development"
},
{
"name": "Timur Ruziev",
"email": "resurtm#gmail.com",
"homepage": "http://resurtm.com/",
"role": "Core framework development"
},
{
"name": "Paul Klimov",
"email": "klimov.paul#gmail.com",
"role": "Core framework development"
},
{
"name": "Dmitry Naumenko",
"email": "d.naumenko.a#gmail.com",
"role": "Core framework development"
},
{
"name": "Boudewijn Vahrmeijer",
"email": "info#dynasource.eu",
"homepage": "http://dynasource.eu",
"role": "Core framework development"
}
],
"support": {
"issues": "https://github.com/yiisoft/yii2/issues?state=open",
"forum": "http://www.yiiframework.com/forum/",
"wiki": "http://www.yiiframework.com/wiki/",
"irc": "irc://irc.freenode.net/yii",
"source": "https://github.com/yiisoft/yii2"
},
"require": {
"php": ">=5.4.0",
"ext-mbstring": "*",
"ext-ctype": "*",
"lib-pcre": "*",
"yiisoft/yii2-composer": "~2.0.4",
"ezyang/htmlpurifier": "~4.6",
"cebe/markdown": "~1.0.0 | ~1.1.0",
"bower-asset/jquery": "2.2.*#stable | 2.1.*#stable | 1.11.*#stable | 1.12.*#stable",
"bower-asset/jquery.inputmask": "~3.2.2 | ~3.3.3",
"bower-asset/punycode": "1.3.*",
"bower-asset/yii2-pjax": "~2.0.1"
},
"autoload": {
"psr-4": {"yii\\": ""}
},
"bin": [
"yii"
],
"extra": {
"branch-alias": {
"dev-master": "2.0.x-dev"
}
}
}

Answer 1

I added to utilities\MarkdownRenderer.php is
require_once __DIR__ . '/../vendor/autoload.php';
And the problem was solved