Fix for: (error code 110)Mount of Outer DMG Failed?

Hi Apple and Mac friends. It got to make the USB flash drive installer but can't make it bootable. What's the fix for this. Thank you in advance (God bless, Rev. 21:4):

/Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

Erasing Disk: 0%... 10%... 20%... 30%...100%...

Copying installer files to disk...

Copy complete.

Making disk bootable...

Couldn't mount dmg /Volumes/Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg (error code 110)Mount of outer dmg failed.

Done.