Laravel >=5.2 breaks the app

[pboethig]

If I increese the composer dependency to laravel 5.3 composer updates fatals on missing illuminati container class loading.

How to fix that?

This is the stacktrace:

php artisan optimize
PHP Fatal error: Uncaught ReflectionException: Class files does not exist in /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php:734
Stack trace:

0 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(734): ReflectionClass->__construct('files')

1 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(629): Illuminate\Container\Container->build('files', Array)

2 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(697): Illuminate\Container\Container->make('files', Array)

3 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(1178): Illuminate\Foundation\Application->make('files')

4 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/I in /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 734

PHP Fatal error: Uncaught ReflectionException: Class files does not exist in /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php:734
Stack trace:

0 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(734): ReflectionClass->__construct('files')

1 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(629): Illuminate\Container\Container->build('files', Array)

2 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(697): Illuminate\Container\Container->make('files', Array)

3 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Container/Container.php(1178): Illuminate\Foundation\Application->make('files')

4 /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/I in /var/www/html/lektionen/twillo/server-notifications-laravel/vendor/laravel/framework/src/Illuminate/Contain