Solved - Error Install ClearOS 6 using USB

I try to install ClearOS 6 for proxy and qos purposes using Bootable flashdisk but not running clear.

There is error as below:

The installer has tried to mount image #1, but cannot find it on the hard drive.
Please copy this image to the drive and click Retry.
Click Exit to abort the installation.

And the solution JUST COPY the ISO file to the USB bootable.

What the hell.
I've lost my time about 2 hours just for this.. haha

I hope this helps someone in the future.