Why does anaconda throw error messages "Unable to read group information from repositories" during installation of Red Hat Enterprise Linux 6 from a DVD media?

Issue

• Red Hat Enterprise Linux 6 installation through DVD shows error: "Unable to read group information from repositories"

While RHEL 6 is being installed on a server using the RHEL 6 DVD image, it gives the following error and exits the installation.
Error message:
Unable to read group information from repositories. This is a problem with the generation of your install tree.

<6>sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
<6>sr 1:0:0:0: [sr0] Add. Sense: CIRC unrecovered error
<3>end_request: I/O error, dev sr0, sector 5583488

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<6>sr: Sense Key : Medium Error [current]
<3>Buffer I/O error on device sr0, logical block 1391776
<3>Buffer I/O error on device sr0, logical block 1391810