Backup failed with Error code 5

[prapplhans]

Hello

I am trying to backup my Terrastation nas to a LS-CHL-V2.
I created a share with only "backup" enabled, no smb, ftp etc.
When i start the backup i get an error code 5. Googling for that says:"No share folder found on backup target" which can not be because the share folder is there and is seen by the backup form where i can point to it.
Any help please

Edit:

Here is the logfile
-------- BEGIN BACKUP 2015/07/17 00:10:49 bsbuffalo010@array1/share -> bsbuffalo003@disk1/weekly --------
@ERROR: Unknown module 'disk1_weekly'
rsync error: error starting client-server protocol (code 5) at main.c(1635) [sender=3.1.0]
Can't write to backup destination(target disk is broken?).
-------- END BACKUP 2015/07/17 00:10:49 bsbuffalo010@array1/share -> bsbuffalo003@disk1/weekly --------

i triple checked, the share *is* there, i can browse it with explorer when enabling smb.

[Texturtle]

Have you tried running the backup with SMB enabled?

[prapplhans]

Yes, no good.

Turns out i need to update the firmware...

Btw dear buffalo, triple capatcha  really? Even if i am logged in? ...... *facepalm*

[Texturtle]

If you saw how much spam we've had to delete...