Kernel.php doesn't exist Laravel 5

I'm following one tutorial while learning laravel but currently I've got this error

Fatal error: Uncaught ReflectionException: Class App\Http\Kernel does not exist in /var/www/html/cms/vendor/laravel/framework/src/Illuminate/Container/Container.php:734

app/Http/Kernel.php is exist

Those are permissions of the file

-rw-rw-r-- 1 ivan www-data 1537 nov 26  2016 Kernel.php

Those are permission on whole directory files

-rw-rw-r--  1 ivan www-data    567 nov 26  2016 server.php
-rw-rw-r--  1 ivan www-data   1918 nov 26  2016 readme.md
-rw-rw-r--  1 ivan www-data   1026 nov 26  2016 phpunit.xml
-rw-rw-r--  1 ivan www-data    212 nov 26  2016 package.json
-rw-rw-r--  1 ivan www-data    503 nov 26  2016 gulpfile.js
-rw-rw-r--  1 ivan www-data   1395 nov 26  2016 composer.json
-rw-rw-r--  1 ivan www-data   1646 nov 26  2016 artisan
drwxr-x---  2 ivan www-data   4096 jan 19 20:06 tests
drwxrwxrwx  5 ivan www-data   4096 jan 19 20:06 storage
drwxr-x---  5 ivan www-data   4096 jan 19 20:06 resources
drwxr-x---  7 ivan www-data   4096 jan 19 20:06 public
drwxr-x---  5 ivan www-data   4096 jan 19 20:06 database
drwxr-x--- 11 ivan www-data   4096 jan 19 20:06 app
-rw-rw-r--  1 ivan www-data 127324 jun  2 15:27 composer.lock
drwxr-x---  2 ivan www-data   4096 jun  2 15:29 config
drwxr-x---  3 ivan www-data   4096 jun  2 15:44 bootstrap
drwxr-xr-x 33 ivan www-data   4096 jun  2 15:48 vendor

When I run in my terminal php artisan serve and tried to load the site on http://localhost:8000 site is running.

What can be the problem here?

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