Event Error with ID 1147

I get this event Error type every morning at 7:00AM. How to troubleshoot or resolve this problem.

EventID: 1147 Category:17 User: U/N Type: Error Source: MsExchangeISPrivate

The description for Event ID ( 1147 ) in Source ( MSExchangeIS Private ) could not be found. It contains the following insertion string(s): Exception List, 0, —.