Are these messages documented anywhere?

I just started using Avamar 7.1 for Exhange VSS and it seems so far to be working well.  One of last night's jobs failed with these messages:

avexvss Info <16242>: Current log files for database xxxx are 00002DCB through 00002E92.

avexvss Info <16242>: Checking for log file continuity with previous backup.

avexvss Error <0000>: Log file gap detected in xxxx between current backup and last backup.

avexvxx Error <0000>: Highest log index from previous backup: 00002D93, lowest current log index: 00002DCB, terminating backup.

Is this an Avamar problem or an Exchange problem?

Is there an explanation of how to correct this?