ORA-16535: Oracle Restart or Oracle Clusterware prevented completion of broker operation
Database version: Oracle 11g Release 2 (11.2)
Cause: The broker could not complete the operation because Oracle Restart (for single instance databases) or Oracle Clusterware (for RAC databases) could not stop services or instances on this database.
Solution: Check the Data Guard broker log file for more information and stop the appropriate services or instances using SRVCTL. Then retry the broker operation.