Can not access drives

Can not access drives

My ubuntu was good somedays ago. Now for some days i am having an error
whenever i tried to access Drives like C:\ , D:\ etc..
The error is:
Error mounting /dev/sda9 at /media/nihan/0296B5E196B5D4FF: Command-line
`mount -t "ntfs" -o
"uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177"
"/dev/sda9" "/media/nihan/0296B5E196B5D4FF"' exited with non-zero exit
status 14: The disk contains an unclean file system (0, 0).
Metadata kept in Windows cache, refused to mount.
Failed to mount '/dev/sda9': 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.
I have installed Ubuntu alongside with Windows 8 and it was good somedays
ago. Please help me.