Answer / guest

Cause: The group name is null, the group name is misspelled,
the invocation database is not a master, or the invocation
database does not believe the given database is a master.

Action: If the given group name was correct, connect to a
current master and retry the request, make the invocation
database a master with add_master_database, or use
switch_mview_master if the invocation database is a
materialized view site.

Please add more information about this Error

NID-00338: Control Files in database:

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NNL-00349: Configuration will be saved in string

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ORA-14282: FOREIGN KEY constraint mismatch in ALTER TABLE EXCHANGE SUBPARTITION

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ORA-39034: Table string does not exist.

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ORA-14075: partition maintenance operations may only be performed on partitioned indices

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ORA-16521: unable to create generic template id

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ORA-15004: alias "string" does not exist

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TNS-00204: Started tracing in intlsnr

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ORA-00297: must specify RECOVER DATAFILE LIST before RECOVER DATAFILE START

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ORA-29961: too many warnings occurred in the execution of ODCIIndex DDL routine

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