err_folder_not_found - Reason unclear

Hi,

i just installed urbackup on my debian (openmediavault) home server and installed the windows client.
When trying to change the backup folder (via webinterface or dkpg-reconfigure) the webinterface always says err_folder_not_found…

The folder is a mount point on my raid 1, linux resides on a separate disk. How can i fix the problem? Thanks in advance!
The linux disk is only 256 GB and way to small acting as a backup disk. Backups have to be made to the RAID disks.

the raid folder is owned by urbackup:urbackup and chmod 770 (tried 777 as well) - does not work…

Philipp

Logfile Error looks like:

2015-10-04 14:38:09: ERROR: No permission to access “/media/3733144a-1326-443f-a648-8396acca147e/home/phil/Backup/urbackup/urbackup_tmp_files”
2015-10-04 14:38:44: WARNING: Shutting down (Signal 15)
2015-10-04 14:38:44: ERROR: No permission to access “/media/3733144a-1326-443f-a648-8396acca147e/home/phil/Backup/urbackup/urbackup_tmp_files”
2015-10-04 14:39:21: ERROR: Could not create or read directory for client “LAPTOPT550”
2015-10-04 14:39:34: WARNING: Shutting down (Signal 15)
2015-10-04 14:39:42: ERROR: No permission to access “/media/3733144a-1326-443f-a648-8396acca147e/home/phil/Backup/urbackup/urbackup_tmp_files”
2015-10-04 14:40:19: ERROR: Could not create or read directory for client “LAPTOPT550”
2015-10-04 14:45:04: ERROR: No permission to access “/media/3733144a-1326-443f-a648-8396acca147e/home/phil/Backup/urbackup/urbackup_tmp_files”
2015-10-04 14:45:40: ERROR: Could not create or read directory for client “LAPTOPT550”

tried everything (Chmod 777, chown, etc. - even adding urback to root-group) Nothing worked. Please advise!