First, try removing and reinstalling the battery, or testing with a different fully charged battery. If the error started right after a drop, there’s a good chance the shutter mechanism is jammed or damaged.

At that point, the safest recommendation is to have the camera professionally serviced. While some people have managed to free a stuck shutter themselves, attempting to pry or force anything inside the camera can easily make the damage worse.

So the practical order is:

1. Power off the camera.
2. Reseat or swap the battery.
3. If the error remains, stop using it and get it inspected/repaired.

Because the problem followed an impact, this is likely a mechanical fault rather than a simple settings issue.