Fatal error: Uncaught Error: Class "mikehaertl\shellcommand\Command" not found in C:\xampp\htdocs\emailer2\vendor\mikehaertl\phpwkhtmltopdf\src\Command.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\emailer2\vendor\mikehaertl\phpwkhtmltopdf\src\Command.php on line 15