Unable to set target system volume for preflight - error on installing Mac OS
I am trying to install Monterey on an external SSD. It is formatted in APFS and there are some files on it.
When clicking to install Monterey, the image is grayed out and I get a "unable to set target system volume for preflight" note.
What the heck does that mean?
Can I install Monterey on it or do I have to reformat the drive. Or could I install another APFS partition?
iMac 27″ 5K, macOS 12.6