OCI-11402
Data Guard site entry not found
Cause
The SYS.DATA_GUARD_SITE$ table in ROOT did not contain the requested site details.
Action
If it is not obvious from the context of the error then the site name or database ID used to lookup up the site can be found in the trace file of the process originally reporting the error. Data Guard Broker is the preferred method to maintain the site configuration data. Try removing and adding the site again.