Rigidbody2d.AddForce Unity Update Problem

I just updated my Unity yesterday, and i opened up my project. But i cant play my game now, and i keep getting an error with my "Rigidbody2d.AddForce. Heres my script, and i hope some of you could help me out.

Code (CSharp):

1. if (Input.GetKeyDown(KeyCode.Space) && grounded){
2.             rigidbody2d.AddForce(new Vector3 (0, 1, 0) * jumpForce);
3.         }