Error 500 in laravel 5.2 when user was loged in

I was run composer update and composer selfupdate in laravel project now I get error 500 and blank white page after user login and see project pages this picture is my log

laravel log

I run this command

php artisan key:generate
php artisan cache:clear 
composer install
composer dump-autoload

anybody can help me?

via Chebli Mohamed