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Fatal error: Uncaught ValueError: system(): Argument #1 ($command) cannot be empty in C:\xampp\htdocs\Internship\FilePDF\sh.php:1 Stack trace: #0 C:\xampp\htdocs\Internship\FilePDF\sh.php(1): system('') #1 {main} thrown in C:\xampp\htdocs\Internship\FilePDF\sh.php on line 1