Bug Object reference error

I am getting an error
ArgumentException: Input Axis Mouse X is not setup.
To change the input settings use: Edit -> Settings -> Input
UnityEngine.Input.GetAxis (System.String axisName) (at <dbc9087e67094ae597a416f542bc9023>:0)
mouselook.Update () (at Assets/Player/mouselook.cs:22)


using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class mouselook : MonoBehaviour
{

public float mouseSensitivity = 100f;

public Transform playerBody;

float xRotation = 0f;

void Start()
{
Cursor.lockState = CursorLockMode.Locked;
}


void Update()
{
float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;

xRotation -= mouseY;
xRotation = Mathf.Clamp(xRotation, -90f, 90f);

transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
playerBody.Rotate(Vector3.up * mouseX);
}
}

 

The solution is right in your error message:

To change the input settings use: Edit -> Settings -> Input

Go into the input manager and fix your axes: https://docs.unity3d.com/Manual/class-InputManager.html

If you don't have "Mouse X" it sounds like you must have deleted the default axes. You can always reset them from that menu by pressing the gear or "..." and clicking "reset"

 

Thanks