clear file cache laravel

PHP
//laravel artisan clear cache 
php artisan view:clear 
php artisan cache:clear
php artisan route:clear
php artisan config:clearFatal error: Uncaught Error: Class 'Illuminate\Foundation\Application' not found in C:\xampp\htdocs\project\datatable\Laravel-Datatables-Demo\bootstrap\app.php:14
Stack trace:
#0 C:\xampp\htdocs\project\datatable\Laravel-Datatables-Demo\artisan(20): require_once()
#1 {main}
  thrown in C:\xampp\htdocs\project\datatable\Laravel-Datatables-Demo\bootstrap\app.php on line 14
Source

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