Have you tried the rest of the problem correction procedure from the manual :
Illegal parameter or structure value
Possible Causes
The Object Data Management (ODM) database was damaged, and the physical volume ID (pvid) of a disk was listed as None.
One of your Customize Device Configuration...
Red Hat ask takers of the RHCE exam to sign a non disclosure agreement.
Red Hat do provide a one week course + exam at end of course.
This course has the prime purpose of enabling reasonably experienced UNIX technicians to pass the exam.
Not for beginners, in my view.
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