rsync - May 2009 - Any idea on this rsync error?

Hi, we have been getting this errors frequently.

ERROR: DoRsync(): rsync had errors or failed
       rsync return code: 12
    unexpected tag -7
    rsync error: error in rsync protocol data stream (code 12) at
io.c(469)
    rsync: connection unexpectedly closed (7087269 bytes read so
far)
    rsync error: error in rsync protocol data stream (code 12) at
io.c(189)

Any idea to avoid it?

Thanks,
Jignesh
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