CHIRP

Good Afternoon;
I'm having an issue programming several Zastone ZT-X6 it keeps giving me this issue i have tried on 2 different computers but it gives me the same issue. I've programmed these radios before but now I keep getting this issue with 4 radios and still have several to program. I'm able to still program the old radios, but not the new ones.

This is the issue it keeps telling me.
An error has occurred
Unexpected error communicating with the radio

I've even uninstalled and reinstalled the program. Also have tried 4 different prolific USB-to-serial comm port cables and on different ports also. the issue still persist.
please advice