Answers for "rf-left not working bootstrap"

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Fatal 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