Fatal error: Uncaught Error: Class "Maatwebsite\Excel\Events\Event" not found in D:\Apache24\www\dls\back-end\vendor\maatwebsite\excel\src\Events\BeforeWriting.php:7 Stack trace: #0 {main} thrown in D:\Apache24\www\dls\back-end\vendor\maatwebsite\excel\src\Events\BeforeWriting.php on line 7