Rsync_bpc Error - BackupPC 4

I am using BackupPC 4.0 on a debian distro to backup two windows computers running Cygwin. I am using rsyncd as the vehicle to back them up. When I try to start a backup, the backup fails apparently because of an rsync_bpc issue. The log file entries are below:

Contents of file /data/BackupPC/pc/agm-pc/LOG.022015, modified 2015-02-24 15:50:55
2015-02-24 15:50:49 full backup started for directory Pictures
2015-02-24 15:50:50 Got fatal error during xfer (No files dumped for share Pictures)
2015-02-24 15:50:55 Backup aborted (No files dumped for share Pictures)

Contents of file /data/BackupPC/pc/agm-pc/XferLOG.bad.z, modified 2015-02-24 15:50:56
XferLOG file /data/BackupPC/pc/agm-pc/XferLOG.0.z created 2015-02-24 15:50:49
Backup prep: type = full, case = 1, inPlace = 1, doDuplicate = 0, newBkupNum = 0, newBkupIdx = 0, lastBkupNum = , lastBkupIdx = (FillCycle = 0, noFillCnt = )
Running: /usr/local/bin/rsync_bpc --bpc-top-dir /data/BackupPC --bpc-host-name agm-pc --bpc-share-name Pictures --bpc-bkup-num 0 --bpc-bkup-comp 3 --bpc-bkup-prevnum -1 --bpc-bkup-prevcomp -1 --bpc-bkup-inode0 1 --bpc-log-level 1 --super --recursive --protect-args --numeric-ids --perms --owner --group -D --times --links --hard-links --delete --partial --log-format=log: %o %i %B %8U,%8G %9l %f%L --stats --checksum --password-file=/data/BackupPC/pc/agm-pc/.rsyncdpw5658 @agm-pc::Pictures /
full backup started for directory Pictures
Xfer PIDs are now 5661
This is the rsync child about to exec /usr/local/bin/rsync_bpc
ERROR: failed to read a password from /data/BackupPC/pc/agm-pc/.rsyncdpw5658
Done: 0 errors, 0 filesExist, 0 sizeExist, 0 sizeExistComp, 0 filesTotal, 0 sizeTotal, 0 filesNew, 0 sizeNew, 0 sizeNewComp, 1 inode
rsync error: syntax or usage error (code 1) at authenticate.c(191) [Receiver=3.0.9.3]
rsync_bpc exited with fatal status 1 (256) (rsync error: syntax or usage error (code 1) at authenticate.c(191) [Receiver=3.0.9.3])
Xfer PIDs are now
Got fatal error during xfer (No files dumped for share Pictures)
Backup aborted (No files dumped for share Pictures)
BackupFailCleanup: nFilesTotal = 0, type = full, BackupCase = 1, inPlace = 1, lastBkupNum =
Removing empty backup #0
BackupPC_backupDelete: removing #0
BackupPC_backupDelete: No prior backup for merge
BackupPC_backupDelete: got 0 errors
Running BackupPC_refCountUpdate -h agm-pc -f on agm-pc
xferPids 5673
BackupPC_refCountUpdate: host agm-pc got 0 errors
BackupPC_refCountPrint: total errors: 0
xferPids
Finished BackupPC_refCountUpdate (running time: 0 sec)

In one of the log files, it indicates the following: “Running: /usr/local/bin/rsync_bpc” and it has the following error message: “ERROR: failed to read a password from /data/BackupPC/pc/agm-pc/.rsyncdpw5658”.

Does anyone recognize that error and know what it means? It seems as though it needs some sort of password but I don't know where to input a password. The only password I know of is in the secrets file on the target Windows machines, but this looks like it is not even connecting to even get that far.

Thanks in advance.

Hi akibuflash,
I have the same issue on all my machines on my test rig.
The path to the rsyncpw file listed in your log lives in your BackupPC pool directory.

I was curious to see if the file was created at all, so I ran the following command in the dir that supposedly would contain the file:

watch -n 0.1 ls -lh

I could briefly spot that the file is actually created.
Next step was to check the contents of the file, did a similar thing, just ran:

watch -n 0.1 cp .rsyncdpw* rsyncpw.bak

Then checked the contents of the file. Now, I'm not sure if the cp command grabbed the file before anything was actually written to the file, but it appears to be empty.

I added a password to the rsyncd password filed in the global config, and did the same thing again, "watch -n 0.1 cp .rsyncdpw* rsyncpw.bak".
This time the file contained the password specified in the global config.

I ran out of time after that. Let me know if you have any progress and manage to work around it.
Cheers