ORA-16209

Error: ORA-16209: Logical standby dictionary build failed to complete.

Causa: The logical standby dictionary build process terminated abnormally.

Acción: Check the accompanying messages and the background process trace file. Correct the problem mentioned in the messages. Then shut down and restart the instance. If the trace file mentions any other background process messages, then check the trace file for the mentioned process until the root message is found.