Can't install macOS 10.14 Mojave as guest on macOS 10.14 Mojave host

Hello,

I am trying to create a new Virtual Machine to run macOS 10.14 Mojave in Fusion 11.0.2, running on a macOS 10.14 Mojave host machine.

When I try and create the new VM, I get an error: "Unable to create the installation medium." This is just when it tries to create the new VM, before it even attempts to start the VM.

I am installing using the downloaded 6GB macOS 10.14 Mojave installer from the App Store.

Please help! Has anyone else had this problem? I really need this to work!

Josh