FindGameObjectWithTag not working after APK build

Questions & Answers
1

My game is working fine during my test in the Unity Editor.

After building the apk and installing on my phone, I am getting :

NullReferenceException: Object reference not set to an instance of an object

It seems that the GameObject.FindGameObjectWithTag was not able to get the “Player” tag. Im not quite sure as I am just new to Unity and game development.

Below is my code including the Debug.Log from Unity Console and ADB. Appreciate the help

void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player").GetComponent<PlayerMovement>();
        isGameStarted = false;
        IsDead = false;

        Debug.Log(player);
    }

Console:

Player (PlayerMovement)
UnityEngine.Debug:Log(Object)
GameManager:Start() (at Assets/Scripts/GameManager.cs:67)

ADB:

12-08 00:30:32.054  2226  6891 I Unity   : Null
12-08 00:30:32.054  2226  6891 I Unity   : (Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)
12-08 00:30:32.054  2226  6891 I Unity   :
12-08 00:30:32.347  2226  6891 E Unity   : NullReferenceException: Object reference not set to an instance of an object
12-08 00:30:32.347  2226  6891 E Unity   :   at GameManager.Start () [0x0003a] in <0eceeb3a1845417d9269f1499c75c894>:0
12-08 00:30:32.347  2226  6891 E Unity   :
12-08 00:30:32.347  2226  6891 E Unity   : (Filename: <0eceeb3a1845417d9269f1499c75c894> Line: 0)
12-08 00:30:32.347  2226  6891 E Unity   :
2

Nevermind, it worked after I changed the tag from “Player” to something else. I am not quite sure why it wasn’t able to pickup the “Player” tag when it is installed on my phone.

3

I had same error. I found two objects with Player tag. Root player object and child. Just remove another Player tag.
I think the order of objects on android is not the same as in the editor.