ORA-28515: cannot get external object definitions

admin

ORA-28515: cannot get external object definitions from string
Cause: ORACLE was unable toretrieve definitions of distributed external
procedures or remote libraries registered for the non-Oracle system instance,
probably because the underlying data dictionary table does not exist or is
malformed.
Action: Verify that theORACLE server's Heterogeneous Services data dictionary
was installed correctly. If the Heterogeneous Services data dictionary is not
installed, execute the CATHS.SQL script in the $ORACLE_HOME/rdbms/admin
directory.