A camera requires a specific amount of light to produce the perfect exposure. The exact same amount of light every time.

In the daytime, their is an abundance of light available. The camera can make adjustments to reduce this light to the right amount.

In low light situations, there is not enough light available.
The camera must open the lens aperture to its maximum setting (f2.8 on your camera).
Then the camera can also raise the ISO setting to as high as it can go (ISO-250 on your camera).
If their is still not enough light, the camera must lower the shutter speed to collect enough light.
If the camera must select a shutter speed of less than 1/60th of a second, the camera shake icon comes on to warn you.

That icon means the camera is going to select a shutter speed between 1/30th to 1/4th of a second (1/4th is your cameras slowest setting).

If you handhold the camera at those speeds, you will likely get a blurred photo.

You can do several things to prevent camera movement:

1. Use a tripod to support the camera.
2. Set the camera on a solid surface.

If you must handhold the camera you can reduce camera shake by:

1. Use the viewfinder instead of the LCD to frame you shots.
2. While using the viewfinder, lean your shoulder against a wall, post, doorway, or other solid object