ORA-12315: database link type is invalid for the ALTER DATABASE statement Cau...

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ORA-12315: database link type is invalid for the ALTER DATABASEstatement
Cause: The database linkname you specified on the ALTER DATABASE
statement is not an ROM: link. You must specify an ROM: link when using the
ALTER DATABASE statement to mount or open a secondary database.
Action: Re-issue the ALTERDATABASE statement using a valid ROM: link to the
database you want to mount or open. If a valid ROM: link does not exist, create
one using the CREATE DATABASE LINK command. See the Trusted ORACLE
RDBMS Guide to Security Features for more information about creating database
links using the ROM: link type.