Fatal error: Uncaught exception 'Exception' with message 'Composer autoloader could not be found. Install dependencies with `composer install` and try again.' in C:\xampp\htdocs\esales2\vendor\phpoffice\phpspreadsheet\src\Bootstrap.php:22 Stack trace: #0 C:\xampp\htdocs\esales2\vendor\phpoffice\phpspreadsheet\samples\Header.php(9): require_once() #1 C:\xampp\htdocs\esales2\vendor\phpoffice\phpspreadsheet\samples\index.php(3): require_once('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\esales2\vendor\phpoffice\phpspreadsheet\src\Bootstrap.php on line 22