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Null exception for public variable

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Hello! I have been trying to get one script to read input from another. I have this script so far: The sender script: using UnityEngine; using System.Collections; public class Test: MonoBehaviour { public jumpAfterTest _jumpAfterTest; void OnMouseDown() { Debug.Log ("Mouse Down"); _jumpAfterTest.JAT (); } void OnMouseUp() { Debug.Log ("Mouse up"); } } And the receiver script: using UnityEngine; using System.Collections; public class jumpAfterTest : MonoBehaviour { public void JAT() { Debug.Log("Me is JAT"); } } The error I am getting is: NullReferenceException: Object reference not set to an instance of an object Test.OnMouseDown () (at Assets/my-scripts/Test.cs:13) UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32, Int32) I am guessing that this error has to do with line 13 of test script: `_jumpAfterTest.JAT ();` How would I fix this? Thanks for the help! I am in mobile, by the way.

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