Laravel 5.6 to Laravel 8 upgrade issue : Class config does not exist

[aherrao]

• Laravel Version: 8.0
• PHP Version: 7.4

Description:

We are using Laravel library in the core PHP project and wanted to update the major version to Laravel-8 but we are facing some internal issues when using helpers like url(), route(), etc.

Also, we don't have php artisan in the project so

php artisan config:clear can't use

Steps To Reproduce:

Just upgrade to laravel-8 from 5.6

**Fatal error**: Uncaught ReflectionException: Class config does not exist in /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Container/Container.php:877 Stack trace: #0 /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Container/Container.php(877): ReflectionClass->__construct('config') #1 /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Container/Container.php(758): Illuminate\Container\Container->build('config') #2 /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(851): Illuminate\Container\Container->resolve('config', Array, true) #3 /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Container/Container.php(694): Illuminate\Foundation\Application->resolve('config', Array) #4 /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(836): Illuminate\Container\Container->make('config', Array) #5 /var/www/wmd/current/w in /var/www/wmd/current/wmdcore-nightly/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 879