Problems with Terminal error in creating a bootable disk

[dphershman]

I'm trying to create a bootable disk on a flash drive with High Sierra

I've downloaded the High Sierra Installer and have reformatted the flash drive with the name BOOTABLE

When running the command (below) in Terminal I get an error message that states that my installer app isn't a valid installer.


Any suggestions?

Thanks!

Daniel-Hershmans-MacBook-Pro:~ dphershman$ sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/BOOTABLE --applicationpath /Applications/Install\ macOS\ High\ Sierra.app --nointeraction &&say Done
Password:
/Applications/Install macOS High Sierra.app does not appear to be a valid OS installer application.
Daniel-Hershmans-MacBook-Pro:~ dphershman$

 

[Nermal]

How big is your installer app? It should be several GB but sometimes you'll end up with a tiny one (I'm not sure why).

 

[dphershman]

How big is your installer app? It should be several GB but sometimes you'll end up with a tiny one (I'm not sure why).

It is 22.7 mb.

 

[CoastalOR]

It is 22.7 mb.

The full installer should be a little over 5 GB. It is 5.25 GB on my system. Delete the current installer you downloaded and try re-downloading until you get the full 5 GB installer.

 

[Fishrrman]

OP:

Looks like you downloaded the "stub installer app" and not the FULL installer.

Please take a few moments and read this:
http://osxdaily.com/2017/09/27/download-complete-macos-high-sierra-installer/