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Whenever we do a composer update, and later delete some controllers, 
the application autoloader will still look for those files and throw exception errors
if they are not found

To fix that problem cache clear wont do, instead update composer again to rebuild
the indexes:
composer update

You might also try and run:
composer dump-autoload -o to update autoloader.

You can clear the cached views by running:
php artisan view:clear

optional:
php artisan cache:clear