mysql: component was not installed

[abo0]

I'm running plesk on a RHEL3.0ES and when I access the component info page on the server administration control panel it says that mysql is not installed but it is installed and I can create db and user from the control panel.
I've checked the mysql rpms installed and this are the results:
MySQL-shared-compat-4.0.20-sp.3ES
MySQL-server-4.0.20-sp.3ES
MySQL-client-4.0.20-sp.3ES
MySQL-Max-4.0.20-sp.3ES
MySQL-devel-4.0.20-sp.3ES

How can I fix this error?
Should I switch tho ART's mysql rpms? And if yes, how can I do it?

Thank you.