`GameManager.m_RoundWinner' is never assigned のエラー

Question

Assets/Scripts/Managers/GameManager.cs(20,25): warning CS0649: Field GameManager.m_RoundWinner' is never assigned to, and will always have its default value null'
とエラーが出ました。

GameManagerには

using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class GameManager : MonoBehaviour
{
    public int m_NumRoundsToWin = 5;        
    public float m_StartDelay = 3f;         
    public float m_EndDelay = 3f;           
    public CameraControl m_CameraControl;   
    public Text m_MessageText;              
    public GameObject m_TankPrefab;         
    public TankManager[] m_Tanks;           


    private int m_RoundNumber;              
    private WaitForSeconds m_StartWait;     
    private WaitForSeconds m_EndWait;       
    private TankManager m_RoundWinner;
    private TankManager m_GameWinner;       


    private void Start()
    {
        m_StartWait = new WaitForSeconds(m_StartDelay);
        m_EndWait = new WaitForSeconds(m_EndDelay);

        SpawnAllTanks();
        SetCameraTargets();

        StartCoroutine(GameLoop());
    }


    private void SpawnAllTanks()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            m_Tanks[i].m_Instance =
                Instantiate(m_TankPrefab, m_Tanks[i].m_SpawnPoint.position, m_Tanks[i].m_SpawnPoint.rotation) as GameObject;
            m_Tanks[i].m_PlayerNumber = i + 1;
            m_Tanks[i].Setup();
        }
    }


    private void SetCameraTargets()
    {
        Transform[] targets = new Transform[m_Tanks.Length];

        for (int i = 0; i < targets.Length; i++)
        {
            targets[i] = m_Tanks[i].m_Instance.transform;
        }

        m_CameraControl.m_Targets = targets;
    }


    private IEnumerator GameLoop()
    {
        yield return StartCoroutine(RoundStarting());
        yield return StartCoroutine(RoundPlaying());
        yield return StartCoroutine(RoundEnding());

    if (m_GameWinner != null)
        {  

			SceneManager.LoadScene (SceneManager.GetActiveScene ().name);
        }
        else
        {
            StartCoroutine(GameLoop());
        }
    }


    private IEnumerator RoundStarting()
    {  
		// As soon as the round starts reset the tanks and make sure they can't move.
		ResetAllTanks ();
		DisableTankControl ();

		// Snap the camera's zoom and position to something appropriate for the reset tanks.
		m_CameraControl.SetStartPositionAndSize ();

		// Increment the round number and display text showing the players what round it is.
		m_RoundNumber++;
		m_MessageText.text = "ROUND " + m_RoundNumber;

		// Wait for the specified length of time until yielding control back to the game loop.
		yield return m_StartWait;
    
    }


    private IEnumerator RoundPlaying()
    {
		EnableTankControl ();

		// Clear the text from the screen.
		m_MessageText.text = string.Empty;

		// While there is not one tank left...
		while (!OneTankLeft())
		{
			// ... return on the next frame.
			yield return null;
		}
    }


    private IEnumerator RoundEnding()
    {
        yield return m_EndWait;
    }


    private bool OneTankLeft()
    {
        int numTanksLeft = 0;

        for (int i = 0; i < m_Tanks.Length; i++)
        {
            if (m_Tanks[i].m_Instance.activeSelf)
                numTanksLeft++;
        }

        return numTanksLeft <= 1;
    }


    private TankManager GetRoundWinner()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            if (m_Tanks[i].m_Instance.activeSelf)
                return m_Tanks[i];
        }

        return null;
    }


    private TankManager GetGameWinner()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            if (m_Tanks[i].m_Wins == m_NumRoundsToWin)
                return m_Tanks[i];
        }

        return null;
    }


    private string EndMessage()
    {
        string message = "DRAW!";

        if (m_RoundWinner != null)
            message = m_RoundWinner.m_ColoredPlayerText + " WINS THE ROUND!";

        message += "\n\n\n\n";

        for (int i = 0; i < m_Tanks.Length; i++)
        {
            message += m_Tanks[i].m_ColoredPlayerText + ": " + m_Tanks[i].m_Wins + " WINS\n";
        }

        if (m_GameWinner != null)
            message = m_GameWinner.m_ColoredPlayerText + " WINS THE GAME!";

        return message;
    }

    private void ResetAllTanks()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            m_Tanks[i].Reset();
        }
    }


    private void EnableTankControl()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            m_Tanks[i].EnableControl();
        }
    }


    private void DisableTankControl()
    {
        for (int i = 0; i < m_Tanks.Length; i++)
        {
            m_Tanks[i].DisableControl();
        }
    }
}

と書きました。
インスペクタの方に必要なものが代入されていないのでしょうか？それともコードに足りないのでしょうか？

Answer 1

Unityに詳しくありませんが、フィールド「m_RoundWinner」に代入する処理が一切見当たらないのが関係すると思います。