ks.cfg is the kickstart file. There are a few different ways that you might resolve this error.
You can try using a USB CD drive. In our experience that does occasionally resolve the issue.
If you are already using a USB CD drive, it could be that the drive hadn't spun up all the way when the install was initialized. Give the drive a moment and try again.
Sometimes this message occurs when the ISO image didn't get copied correctly.
Check the md5sum hash of the ISO image you downloaded to see that it verifies. Refer to the following Knowledge Base article for more information on md5sum verification:
Using md5sum to check the correctness, integrity of a downloaded file
Occasionally, even if the md5sum hash does verify, you may get this error. Sometimes burning the CD again resolves the issue.