Trying to install Ventura to new SSD - APFS disks may not be used as bootable install media

Hi,

I have a Catalina system. I am now trying to install Ventura separately on a new SSD. I am following steps here


I have downloaded Ventura. In my Applications folder on my Catalina drive I see "Install macOS Ventura". 12.24 GB

When I run - per instructions -

sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/USB /Applications/Install\...

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