When I attempt to start up my standby database after activating it, I receive the following error:

ORA-01190: controlfile or data file 1 is from before the last RESETLOGS.
ORA-01110: data file 1: '/v01/oradata/prod/system01.dbf'

I suppose the data files on the standby would be older then the last RESETLOGS since it does a RESETLOG logs automatically when you issue the ACTIVATE STANDBY command.

Does something need to be done to the datafiles on the standby before you can activate the standby? I do have all of the archived redo logs applied.

Any insight would be greatly appreciated.