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Can't call script from another scene using DONTDESTROYONLOAD().

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I wanna alter the variable of senstivityX and sensitvityY of player. MouseController script is attached to the player and camera of the player. The player is in another scene. I wanna change the mouse sensitivity from the Main Menu Scene using Slider. I'm using DontDestroyOnLoad() function to accomplish this. But, the problem is show me the error > Object not set to an reference. Actually, the MENU script (it's in MainMenu scene) tries to search the player within Main Menu scene, whereas player in another scene("FPS_Battle"). I don't know what am I doing wrong. Even though I'm using the DontDestroyOnLoad() function. Here's menu script which is assigned to an empty gameobject and it's in Main Menu scene. using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.SceneManagement; public class Menu : MonoBehaviour { private Slider sens; private GameObject playerSens; private GameObject CameraSens; void Start(){ DontDestroyOnLoad (this.gameObject); //dont destroy this gameobject so that it can be used further in another scene. sens = GameObject.FindGameObjectWithTag ("sensX").GetComponent (); //access the slider compoenent in scene1(menu); playerSens = GameObject.FindGameObjectWithTag ("Player"); //search for the player gameobect of player in scene2 CameraSens = GameObject.FindGameObjectWithTag ("CameraSens"); //search for the camera gameobject of player in scene2 } public void Senstivity(){ playerSens.GetComponent ().sensitivityX = sens.value; //change the sensitivity of player - X axis - ** CameraSens.GetComponent ().sensitivityY = sens.value; //change the senstivity of camera - Y axis } //When I change the senstivity it shows from error that object not reference set. ** } } I don't wanna use STATIC keyword as it poses some problems for me. Thanks!!

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