( ! ) Warning: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' (this will throw an Error in a future version of PHP) in C:\wamp64\www\winpax_listados\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 70
Call Stack
#	Time	Memory	Function	Location
1	0.0010	406592	{main}( )	...\Autoloader.php:0
2	0.0011	407448	spl_autoload_call ( )	...\Autoloader.php:11
3	0.0011	407496	PHPExcel_Autoloader::load( )	...\Autoloader.php:11

( ! ) Fatal error: Uncaught Error: Class 'PHPExcel_Shared_String' not found in C:\wamp64\www\winpax_listados\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 11
( ! ) Error: Class 'PHPExcel_Shared_String' not found in C:\wamp64\www\winpax_listados\vendor\phpoffice\phpexcel\Classes\PHPExcel\Autoloader.php on line 11
Call Stack
#	Time	Memory	Function	Location
1	0.0010	406592	{main}( )	...\Autoloader.php:0