Restore Failure on creating OSX Lion on key drive?

I've tried creating a Lion key drive about 5 times with 3 different key drives. I've followed the directions here:

http://www.macworld.com/article/1160124/osxflashdrive.html


However I am getting an error message almost as soon as the Disk Utility app has almost finished restoring the image. When Disc Utility is done the key drive is no longer present on the desktop however it still shows in Disc Utility. So I eject the key drive within Disc Utility and remove the drive, put it back in the USB port and it appears to show it as a OSX Lion install disc. Ideas on what to do? Do you think it created it fine?

Here is a screen shot of the message:

 

Thanks however, I've already tried that but forgot to post it.

 

Even after re-downloading it again. I decided to try and burn it to a dvd (single layer DVD-R) and when I click on burn in Disc Utility...it says

"Unable to burn InstallESD.dmg." (Invalid Checksum)