Verify that the USB to Serial Adapter connected to your K144XV is the one you have chosen on the Port page.
If your computer has several USB ports, different port names may be assigned depending on where you plug in the USB to Serial Adapter.
You may find it helpful to remove the USB to Serial Adapter, examine the list of Serial ports, then plug in the USB to Serial Adapter and look for the Serial port that was added when the USB device was plugged in