Argument: Input Axis Horizontal is not set up.

I have followed the unity tutorial on YT (tanks). Everything works fin. Now I tryed to expand th game a little bit by using more tanks. So that you can choose which you want to drive. But now he gives me evry update the ERROR: ArgumentException: Input Axis Horizontal is not setup. To change the input settings use: Edit -> Project Settings -> Input

i know that there are some other people in this forum with the same question, but i can't find a solution for my problem.

Please help.

Sorry for my bad english...

Here is my code and apicture of the inputmanager: -GameManager -TankManager -TankMovement

 private void Start()
         {
             selectioManager = GameObject.FindGameObjectWithTag("SelectionManager").GetComponent<SelectionManager>();
             // Create the delays so they only have to be made once.
             m_StartWait = new WaitForSeconds(m_StartDelay);
             m_EndWait = new WaitForSeconds(m_EndDelay);
 
             selectioManager.setTankPlayer1(0);
             selectioManager.setTankPlayer2(0);
             FindTanksToSpawn();
             SpawnAllTanks();
             SetCameraTargets();
 
             // Once the tanks have been created and the camera is using them as targets, start the game.
             StartCoroutine(GameLoop());
         }
 
 
         private void SpawnAllTanks()
         {
             m_Tanks[0].m_Instance =
                 Instantiate(TankPlayer1, m_Tanks[0].m_SpawnPoint.position, m_Tanks[0].m_SpawnPoint.rotation) as GameObject;
             m_Tanks[0].m_PlayerNumber = 1;
             m_Tanks[0].Setup();
 
             m_Tanks[1].m_Instance =
                 Instantiate(TankPlayer2, m_Tanks[1].m_SpawnPoint.position, m_Tanks[1].m_SpawnPoint.rotation) as GameObject;
             m_Tanks[1].m_PlayerNumber = 2;
             m_Tanks[1].Setup();
         }
 
 public void FindTanksToSpawn()
         {
             for (int i = 0; i <= m_TankPrefab.Length; i++)
             {
                 if (PlayerPrefs.GetInt("TankSpieler1") == i)
                 {
                     TankPlayer1 = m_TankPrefab[i];
                 }
             }
 
             for (int i = 0; i <= m_TankPrefab.Length; i++)
             {
                 if (PlayerPrefs.GetInt("TankSpieler2") == i)
                 {
                     TankPlayer2 = m_TankPrefab[i];
                 }
             }
         }





  public void Setup ()
         {
             // Get references to the components.
             m_Movement = m_Instance.GetComponent<TankMovement> ();
             m_Shooting = m_Instance.GetComponent<TankShooting> ();
             m_CanvasGameObject = m_Instance.GetComponentInChildren<Canvas> ().gameObject;
 
             // Set the player numbers to be consistent across the scripts.
             m_Movement.m_PlayerNumber = m_PlayerNumber;
             m_Shooting.m_PlayerNumber = m_PlayerNumber;
 
             // Create a string using the correct color that says 'PLAYER 1' etc based on the tank's color and the player's number.
             m_ColoredPlayerText = "<color=#" + ColorUtility.ToHtmlStringRGB(m_PlayerColor) + ">PLAYER " + m_PlayerNumber + "</color>";
 
             // Get all of the renderers of the tank.
             MeshRenderer[] renderers = m_Instance.GetComponentsInChildren<MeshRenderer> ();
 
             // Go through all the renderers...
             for (int i = 0; i < renderers.Length; i++)
             {
                 // ... set their material color to the color specific to this tank.
                 renderers[i].material.color = m_PlayerColor;
             }
         }
 





 private void Start ()
         {
             // The axes names are based on player number.
             m_MovementAxisName = "Vertical" + m_PlayerNumber;
             m_TurnAxisName = "Horizontal" + m_PlayerNumber;
 
             // Store the original pitch of the audio source.
             m_OriginalPitch = m_MovementAudio.pitch;
         }
 
 
         private void Update ()
         {
             // Store the value of both input axes.
             m_MovementInputValue = Input.GetAxis (m_MovementAxisName);
             m_TurnInputValue = Input.GetAxis (m_TurnAxisName);
 
             EngineAudio ();
         }