Notice: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' in C:\Program Files\Apache Software Foundation\Apache2.4\htdocs\estabelecimento\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 70

Fatal error: Uncaught Error: Class 'PHPExcel_Shared_String' not found in C:\Program Files\Apache Software Foundation\Apache2.4\htdocs\estabelecimento\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php:11 Stack trace: #0 {main} thrown in C:\Program Files\Apache Software Foundation\Apache2.4\htdocs\estabelecimento\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 11