( ! ) Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Calculation\Database\DatabaseAbstract' not found in C:\Users\Lenovo\Documents\college\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Calculation\Database\DSum.php on line 8
( ! ) Error: Class 'PhpOffice\PhpSpreadsheet\Calculation\Database\DatabaseAbstract' not found in C:\Users\Lenovo\Documents\college\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Calculation\Database\DSum.php on line 8
Call Stack
#	Time	Memory	Function	Location
1	0.0605	362616	{main}( )	...\DSum.php:0