[Box Backup] ERROR: Exception caught (Connection Protocol_UnexpectedReply (Server probably reported an error.) 7/47

[Steve]

My BoxBackup logs show the following disconcerting error:
> Jan 13 03:18:15 kenneth bbackupd[2803]: NOTICE: Beginning scan of
> local files
> Jan 13 03:18:15 kenneth bbstored[2050]: NOTICE: Message from child
> process 979: Incoming connection from 10.0.1.2 port 35751
> Jan 13 03:18:15 kenneth bbstored client=0x00000001[979]: NOTICE: Login
> from Client ID 0x00000001 Read/Write
> Jan 13 03:18:29 kenneth bbstored client=0x00000001[979]: ERROR:
> Expected raidfile backup/00000001/78/10/oeb does not exist
> Jan 13 03:18:29 kenneth bbstored client=0x00000001[979]: WARNING:
> Exception thrown: RaidFileException(RaidFileDoesntExist) at
> RaidFileRead.cpp(1026)
> Jan 13 03:18:29 kenneth bbackupd[2803]: WARNING: ListDirectory command
> failed: received error DoesNotExist = 7
> Jan 13 03:18:29 kenneth bbackupd[2803]: WARNING: Exception thrown:
> ConnectionException(Conn_Protocol_UnexpectedReply) at
> autogen_BackupProtocolClient.cpp(1545)
> Jan 13 03:18:29 kenneth bbstored client=0x00000001[979]: NOTICE:
> Session finished for Client ID 0x00000001
> Jan 13 03:18:29 kenneth bbstored client=0x00000001[979]: NOTICE:
> Connection statistics for BACKUP-00000001: IN=17501 OUT=168614
> TOTAL=186115
> Jan 13 03:18:29 kenneth bbackupd[2803]: ERROR: Exception caught
> (Connection Protocol_UnexpectedReply (Server probably reported an
> error.) 7/47), reset state and waiting to retry...

Both bbstored and bbackupd are running on the same host, so there are no
LAN/WAN communication issues.  There is lots of free disk space (about
40% of a 1GB total) and there are no other disconcerting error messages
in the logs.  At 03:18, the only recent activity on the host would have
been received email.... (the Maildir to which mail is delivered is a
target for BoxBackup.)

When I look at the bbstored 'raid' configuration storage location, I
notice this:

> $ ls /var/boxbackup/backup/00000001/78/10/oe*
> oe0.rfw  oe2.rfw  oe7.rfw  oe9.rfw  oed.rfw  oef.rfw
> oe1.rfw  oe6.rfw  oe8.rfw  oec.rfw  oee.rfw
> $

There doesn't seem to be such a file... BoxBackup appears to have been
running smoothly for months until this error.

Is this a known issue?