What went wrong with this partition mount?

What went wrong with this partition mount?

Error mounting /dev/sda2 at /run/media/Juno/Two: Command-line `mount -t
"ntfs" -o
"uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177"
"/dev/sda2" "/run/media/aunshi/Two"' exited with non-zero exit status 13:
$MFTMirr does not match $MFT (record 0).
Failed to mount '/dev/sda2': Eingabe-/Ausgabefehler
NTFS is either inconsistent, or there is a hardware fault, or it's a
SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
then reboot into Windows twice. The usage of the /f parameter is very
important! If the device is a SoftRAID/FakeRAID then first activate
it and mount a different device under the /dev/mapper/ directory, (e.g.
/dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
for more details.
The HDD is GPT formated large disk and the partition in question is the
second one. Mounting was done simply by double-clicking on the drive. The
disk is fine under windows. Can someone enlighten me? Thanks.