ORA-00259: log string of open instance string (thread string ) is the curr...

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ORA-00259: log string  of open instance string  (thread  string ) is the current log,
cannot archive
Cause:  An attempt was made to archive the current log of an open thread. This is
not allowed because the redo log file may still be in use for the generation of redo
entries.
Action:   Force a log switch in the instance where the thread is open. If no instances
are open, open the database so that instance recovery can recover the thread.