seeing as this is RHEL 5 and this is a very well known and very well documented "bug"
and has been around in RHEL5 since 2007
do a search of the Red hat knowledge base for the answer
copy down the error and search for that
https://access.redhat.com/knowledge/search
you will need the required support contract you did buy
Because you will need to log in to red hat web site to use the search