Unable to complete File Backup

SOLVED

Hi all,

Whenever the system tries to do a file backup full or incremental I get the following error:

Errors
08.05.15 16:13
Cannot access directory to backup: “\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy36_NONUSB” Errorcode: 2 - The system cannot find the file specified.
Errors
08.05.15 16:13
Constructing of filelist of “uk-400017” failed: error - index error
Errors
08.05.15 16:13
Backup had errors. Deleting partial backup.

My Server is WHS2012 Essentials R2 and the Client is Windows 7 Enterprise.
Image backup works with no issues
It also does not matter which drives I enter i the options the error message always shows _NONUSB even if the entry is just C or ALL

Please help