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RSM Log Apply Engine: SetState Error (16501,1) switchover failed.

 hi,
Could somebody please help me in understanding data guard switchover logic. my switchover failed with below error

DG 2010-09-03-00:14:01  1000000 3 721423093 DMON: Database ems_p is still working on the task.
DG 2010-09-03-00:14:16  1000000 3 721423093 DMON: Database ems_p is still working on the task.
DG 2010-09-03-00:14:31  1000000 3 721423093 DMON: Database ems_p is still working on the task.
DG 2010-09-03-00:14:33  1000000 3 721423093 Operation CTL_SWITCH cancelled during phase 4, error = ORA-16749
DG 2010-09-03-00:14:33  1000000 3 721423093 DMON: CLSR being notified to enable services and startup primary instances as appropriate for SWITCHOVER.
DG 2010-09-03-00:14:33        0 2 0 CLSR: clsr_dbg_buildup_database(): prsr_init() failed, rc = 3

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