PH Probe Calibration error, need help please

Hi, I just purchased new the GHL KHD with 2.1SA doser bundle.

I am using it as stand alone connecting to it via my Iphone directly though Wifi.

I am up to the KHD Calibration for the Probe. Every time i start the process and press next i get a pop up window with " Error Calibration Failed. please try again"

I have tried a different probe and it does the same thing, so the probe is fine.

Any help would be appreciated.

https://i.ibb.co/YdbWXVx/image1-002.png

got this sorted, was told the App has issues at the moment calibrating the PH probe and will be sorted next update.