Oracle Error Message
ORA-16439: Standby not ready to receive redo at this time
Reason for the Error
A logical standby or down stream capture database was not in a state where it could accept a request to receive redo from another database. This was likely due to the database not being open.
Solution
See the database alert log at the receiving side of the transfer for details of why the database was not ready. If the database was mounted but not open, open it to clear the problem. The initialization parameter LOG_ARCHIVE_DEST_STATE_n at the sending site may need to be set to ENABLE.