1. Issue

The package has been already installed. But laravel shows 'Package Class not found'

2. Solutions

Solution 1

add a route in the routes file and call the route

                    Route::get('/clear-cache', function() {
                        Artisan::call('cache:clear');
                        Artisan::call('config:cache');
                        return "Cache is cleared";
                    });
                    

Solution 2

Remove the cache files from boostrap/cache folder