Boot Camp - can't create a new partition or locate an existing one.
I am running macOS Mojave 10.14.6 on Mac mini late 2014.
I wanted to install Windows with Boot Camp Assistant. I have external USB flash drive for Windows installation bootable drive, and I want to split Mojave SSD so that Windows have basic 40GB partition.
Everything is running pretty smoothly, but at the last step in Windows setup I am getting
message: We couldn't create a new partition or locate an existing one.
After that I can only exit installation and go back to macOS.
Does anybody know how to solve this installation issue?
Mac mini, macOS 10.14