这框架系统扔到服务器就不行了？

Fatal error: Uncaught ReflectionException: Class App\Http\Kernel does not exist in /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php:729 Stack trace: #0 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php(729): ReflectionClass->__construct('App\Http\Kernel') #1 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php(608): Illuminate\Container\Container->build('App\Http\Kernel') #2 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php(564): Illuminate\Container\Container->resolve('App\Http\Kernel', Array) #3 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(709): Illuminate\Container\Container->makeWith('App\Http\Kernel', Array) #4 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php(248): Illuminate\Foundation\Application->makeWith('App\Http\Kernel', Array) #5 /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Containe in /usr/local/www/y2/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 729

报这种错误
这如何解决
composer duml-autoload这种方法试过了 没作用