Whonix Gateway Startup Problem

Im having a problems with the gateway on start up it says:

/dev/sda1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY
(i.e. , without -a or -p options
fsck exited with status code 4
done.
Failure: file system check of the root filesystem failed
The root on the filesystem on /dev/sda1 requires a manual fsck

Any help on how to get the gateway working again would be appreciated

Hard: Fix it as per Whonix ™ - Anonymous Operating System.

Easier: Get a new Whonix-Gateway.

Background: Perhaps either a software or hardware issue with your physical hdd.