I'm able to boot into Raspbian, but the screen is black and is showing the icons and I'm not able to use Keyboard or mouse. It was working fine until today.
and this is what I'm getting before the login. Is this a kernel error?
Is this a kernel error?
Probably not. It is more likely evidence of a corrupted filesystem, especially since
fsck (which can usually repair minor problems) failed.
You'll need to either:
fsck on all partitions in another computer to see what it says there.
Restore the card from backup.
Recreate the card.
As goldilocks said, your file system is most likely corrupt. To make a backup of your files, you could plug the sd card into a computer and copy all of the important files you would like to keep before you put a new image on the sd card.