Getting error "Child exited prematurely" during backup of server

I have recently started getting a backup failure ("Child exited prematurely") on 1 out of our 6 servers being backed-up by backuppc on a debian Linux server.  Previously this server has been backing up with no problems.

Looking at the error log, there are thousands of lines as follows:

Can't open /var/lib/backuppc/pc/<server>/new//f%2fetc/ for empty output

which I assume are the reason for the "Child exited prematurely" error.   Notice I just put <server> in place of the actual server name that shows up there.  

How can I fix this?

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Here is a bit more directly from the log:

Running: /usr/bin/ssh -q -x -l backuppc postman nice -n 19 sudo /usr/bin/rsync --server --sender --numeric-ids --perms --owner --group --devices --links --times --block-size=2048 --recursive --ignore-times . /etc/
Xfer PIDs are now 14751
Got remote protocol 29
Xfer PIDs are now 14751,14752
.: md4 doesn't match: will retry in phase 1; file removed
[ skipped 939 lines ]
Can't open /var/lib/backuppc/pc/postman/new//f%2fetc/ for empty output
[ skipped 1 lines ]
Can't open /var/lib/backuppc/pc/postman/new//f%2fetc/ for empty output
[ skipped 1 lines ]
Can't open /var/lib/backuppc/pc/postman/new//f%2fetc/ for empty output
[ skipped 1 lines ]
... and on and on repeated
mvidAsked:
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MikeOM_DBACommented:

Must be a very precocious child {snicker}...


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mvidAuthor Commented:
I may have fixed the problem... at least I'm not getting errors anymore and the backup is working again.  I changed --devices to -D for variables $Conf{RsyncArgs} and $Conf{RsyncRestoreArgs} in file /etc/backuppc/config.pl
I found this suggestion elsewhere but pertaining to an older version of backuppc... so I'm not sure if this is what fixed it, but seeing as I changed nothing else, it must be.
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