error installing in Powerbook G4

Hello,

After entering the language, appears the following error:

"It has been not possible to create the repository
from the URL 'cd:///?devices=/dev/hdc”.

Details:
Error mounting cd:///?devices=/dev/hdc in : Mounting media failed"

In this point I aborted the installation and verified the DVD in the menu Expert.

I don’t know how to continue at this stage.

Regards