I am running macOS Sierra 10.12.4 Beta (16E144f) off of an external SSD connected to my 13-inch retina MacBook Pro. I am trying to install Windows 10 on it.
When I open up Boot Camp Assistant and press "Continue," I get the following error:
Boot Camp Assistant cannot be used.
The disk is not journaled. You must enable journaling using Disk Utility before using the Boot Camp Assistant.
Can anyone help me solve this rather cryptic problem? I tried searching online to no avail.