1. Add csrf field on the form where request is submitted

<form method="POST" action="/profile">
    {{ csrf_field() }}
    ...
</form>

2. Ensure following laravel and storage folder permission

//whole laravel project permission
sudo chmod 775 -R laravel_project

//within laravel project change storage folder permission to:
sudo chmod 777 -R storage

3. Check your session config path and remove everything inside session folder

'files' => storage_path().'/framework/sessions',

4. Run composer dump-autoload and clear cache

php artisan clear-compiled
composer dump-autoload
php artisan cache-clear

Hope it works!