GCPro Key Port Not Exist Problem

Whenever I try to unlock phones that require the ports (for example, the G900P on 6.0 in order to enable GCF at the same time) or any phone, the program gives me an error stating "Port Not Exist…" and the only option is to select OK.

The problem is that the program detects all the ports when you click ‘Scan Port’ but cannot connect to them or access them. This also affects any UART fucntion.

Cam somebody help me with this issue. No other program or tool has this problem accessing the ports and I’ve installed and uninstalled the drivers for samsung phones and lg phones, which are what I use mostly.

I attached an image to help you see what I mean.