error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class playercontroller : MonoBehaviour 
{
		void FixedUpdate ()
		{
			float moveHorizontal = Input.GetAxis ("input.Horizontal");
			float moveVertical = Input.GetAxis ("input.Vertical");

			Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
		
		GetComponent<Rigidbody>(Vector3);
		}
}
2

on line 13, you’re passing a TYPE, the type is Vector3, it expected the type to be constructed and qualified.

GetComponent<Rigidbody>(Vector3);

should have a value of some sort.

GetComponent<Rigidbody>().AddForce(new Vector3(1.1f, 2.5f, 0));

Vector3 also supplies simple Vector3 objects(forward, back, etc.) which you can see as static variables that return Vector3 objects, this is described at the beginning of the Vector3 documentation.