Install macOS Ventura.app does not appear to be a valid OS installer application.

Follow advise from @ leroydouglas above.

It is all predicated on the Full ( 12.xx GB ) Ventura Application is in the Applications folder of this computer.

You may also what to grant Terminal FULL Disk access but only a suggestion

Have used the Terminal command from previous contributor many times and no issues at all.

refer to image below

1fastskater wrote:

While trying to make a bootable USB installer I get the following error message. The "createinstallmedia" appears to work with no arguments spitting out the usage.

sh-3.2# /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled/

/Applications/Install macOS Ventura.app does not appear to be a valid OS installer application.

sh-3.2# /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia

Usage: createinstallmedia --volume <path to volume to convert>

Arguments

--volume, A path to a volume that can be unmounted and erased to create the install media.

--nointeraction, Erase the disk pointed to by volume without prompting for confirmation.

--downloadassets, Download on-demand assets that may be required for installation.

Example: createinstallmedia --volume /Volumes/Untitled

sh-3.2# ls -ls /Volumes/Untitled/

total 16

16 -rw-r--r--@ 1 _unknown _unknown 6148 Mar 6 11:41 .DS_Store

 0 drwx------ 3 _unknown _unknown  136 Mar 6 11:40 .Spotlight-V100

 0 drwx------ 2 _unknown _unknown  238 Mar 6 13:00 .fseventsd

Try again...?

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

ref: Create a bootable installer for macOS - Apple Support

Did you get it from Apple?