Roll a Ball Tutorial Error with Unity 5

Recently I’ve decided to teach myself how to use Unity for a class (Independent Study to be specific) for school and while doing the 1st tutorial I have come across an odd error. After the second video “Move Player” when I try to compile I get an error saying “Assets/Scripts/PlayerController.cs(8,17): error CS0029: Cannot implicitly convert type UnityEngine.Rigidbody[]' to UnityEngine.Rigidbody’” currently the script I have written for it is

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {
	private Rigidbody rb;
	// Use this for initialization
	void Start () {
		rb = GetComponents<Rigidbody>();
	}

	void FixedUpdate(){
		float mHoriz = Input.GetAxis ("Horizontal");
		float mVert = Input.GetAxis ("Vertical");
		Vector3 movement = new Vector3 (mHoriz, 0.0f, mVert);
		rb.AddForce (movement);
	}
}

GetComponents should be GetComponent

GetComponents is an Array of Components

GetComponent is a single Component