Linux Kickstart issues

Hi Folks,

Hoping some here can help??

I can successfully build RHEL 7.4 in a VM using Kickstart, works perfectly every time!!

However, take the same iso to a usb drive and attempt to build a physical machine and when the installation phase starts the following unknown error occurs, all of the Googling so far tells me about Fedora bugs, anyone have any ideas??

Attribute error: 'NoneType' object has no attribute 'getPartitonByPath'

I am using the RHEL automatic disk layout, a very basic cfg file.

Thanks