( ! ) Notice: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' in F:\konplast\xampp\htdocs\gkp_dataset\api\PHPExcel\Autoloader.php on line 73
Call Stack
#	Time	Memory	Function	Location
1	0.0002	144624	{main}( )	..\Autoloader.php:0
2	0.0002	145104	spl_autoload_call ( )	..\Autoloader.php:36
3	0.0002	145168	PHPExcel_Autoloader::Load( )	..\Autoloader.php:0

( ! ) Fatal error: Class 'PHPExcel_Shared_String' not found in F:\konplast\xampp\htdocs\gkp_dataset\api\PHPExcel\Autoloader.php on line 36
Call Stack
#	Time	Memory	Function	Location
1	0.0002	144624	{main}( )	..\Autoloader.php:0