When I prepare windows image in audit mode and use sysprep, after boot from fog to capture the image its…

Could not mount /dev/sda1 (/bin/fog.upload->beginUpload)

Args Passed:
Reason: The disk contains an unclean file system (0, 0)
Metadata kept in Windows cache, refused to mount.
Failed to mount ‘/dev/sda1’: Operation not permitted
The NTFS partition is in an unsafe state. Please resume and shutdown
Windows fully (no hibernation or fast restarting),
or mount the volume read-only with the ‘ro’ mount option.

Any reason?