Fatal error: Uncaught Error: Class 'ModbusTcpClient\Packet\ProtocolDataUnitRequest' not found in C:\xampp\htdocs\src\Packet\ModbusFunction\WriteMultipleCoilsRequest.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\src\Packet\ModbusFunction\WriteMultipleCoilsRequest.php on line 29