Urbackup OMV on HC1 error

Having errors trying to do file backup on a HC1 Odriod with OMV. I keep getting this error on file backup : Cannot create directory /srv/dev-disk-by-label-Main/Backup//DESKTOP-EP7L62A/180212-2042 for backup (server error). File exists (code: 17)

Image backup works fine it is just the file backup that gives the error. Have reinstalled and it happens every time.
Server version is 2.1.19 and client is 2.1.17 . Path it folder is fine and permisions are set . Same settings work fine under a normal pc install of OMV with Urbackup .
OMV = Open Media Vault
Any ideas?

Could you also look into /var/log/urbackup.log if there are any other hints there?