I also faced such issue while working on a laravel project and after several rearch I found a solution which worked for me and it was really unexpected for me and that is the below command you can use in such scenario.
composer dump-autoload
Additionally, you can also use these below command collectively to avoid any other cache issue of laravel.
php artisan cache:clear
php artisan config:cache
php artisan view:clear
php artisan route:clear
Hope it will solve your problem.
