ORA-00252

Error: ORA-00252: log string of thread string is empty, cannot archive

Causa: A log must be used for redo generation before it can be archived. The specified redo log was not been used since it was introduced to the database. However, it is possible that the instance died during a log switch and the log was empty.

Acción: Empty logs do not need to be archived. Do not attempt to archive the redo log file.