Oracle Error Message
ORA-12324: cannot use the ROM: link type on a private database link
Reason for the Error
You can only specify the ROM: link type on a public, not a private, database link.
Solution
Determine if there is an existing public database link to the secondary database. If not, and if you wish to establish public access to the secondary database, create a public database link to the secondary database using the CREATE DATABASE LINK command.