High Sierra - Bootable USB - Can't make

I have a problem with making bootable USB.

I'm getting this error:

Macintosh:~ **$ sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
Ready to start.
To continue we need to erase the volume at /Volumes/Untitled.
If you wish to continue type (Y) then press return: y
APFS disks may not be used as bootable install media.

On the same usb drive I had Yosemite, but for some reason I can't make it work with High Sierra. Also tried to erase it in Disk Utility(no errors).

Can somebody help?

I think the message is quite straightforward: It seems like your USB stick is formatted as APFS and the error message says that you can't.

Reformat the USB Stick using Mac OS Extended instead.

Make sure your Internal Disk is not called "Untitled" if so choose a different name for your USB. You can do ls /Volumes to see all your disk names.

I had the same issue, but solve it using Paragon free software to downgrade to HFS+, as the Disk Utility didn't have to option to erase it to that format.

https://www.paragon-software.com/home/apfs-hfs-converter/