Error: The SHA1 of your Live CD is invalid. You can run this program with the --noverify argument to bypass this verification check.

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I am new to Linux world. I tried to make fedora USB media using liveUSB creator. After setting up everything and run Create Live USB I got this error:

Error: The SHA1 of your Live CD is invalid. You can run this program with the --noverify argument to bypass this verification check.

What I am doing wrong or what I have to do before creating the live USB. I followed the steps in my first try "http://docs.fedoraproject.org/en-US/Fedora/17/html/InstallationGuide/MakingUSB_Media.html"