Error CS0120 when following Unity's beginners tutorial "ROLL-A-BALL"

Hi!
We are trying to follow this Unity tutorial http://unity3d.com/learn/tutorials/projects/roll-a-ball/moving-the-player.
But we get this error: “Assets/Scripts/PlayerController.cs(13,19): error CS0120: An object reference is required to access non-static member `UnityEngine.Rigidbody.AddForce(UnityEngine.Vector3, UnityEngine.ForceMode)”.
I know similar questions have been posted before but we are totally new to coding and just need to know what our script should look like. Right now it’s exactly as in the tutorial, I Think… This is what it looks like:
40338-unity-error-cs0120.png

Please be very clear in your answer since we don’t understand all the coder’s Words. Yet! :wink:
Thank you!

The API was updated since the video was made so you have to use this now:

GetComponent<Rigidbody>().AddForce (movement);

instead of what the video shows. I hope this helps!

Edit : Unity 5

Line 13: rigidbody, not Rigidbody.

Clear enough? :slight_smile:

Edit : Unity 4