This was working fine until now?

So I'm getting a few errors here that don't make any sense, everything is pointing in the right direction. I really don't get it.

Error #1:

Code (csharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. NPCTankController.Initialize () (at Assets/Scripts/AdvancedFSM/NPCTankController.cs:44)
3. FSM.Start () (at Assets/Scripts/AdvancedFSM/FSM.cs:24)

NPCTankController.Initialize () line 43 & 44:

Code (csharp):

1. //Get the target enemy(Player)
2.   objPlayer = GameObject.FindGameObjectWithTag("Player");
3.   playerTransform = objPlayer.transform;

FSM.Start() line 24:

Code (csharp):

1. void Start ()
2.   {
3.   Initialize();
4.    }

Error #2:

Code (csharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. NPCTankController.FSMFixedUpdate () (at Assets/Scripts/AdvancedFSM/NPCTankController.cs:64)
3. FSM.FixedUpdate () (at Assets/Scripts/AdvancedFSM/FSM.cs:36)

NPCTankController.FSMFixedUpdate () line 64

Code (csharp):

1. protected override void FSMFixedUpdate()
2.   {
3.   CurrentState.Reason(playerTransform, transform);
4.   CurrentState.Act(playerTransform, transform);
5.   }

FSM.FixedUpdate () line 36

Code (csharp):

1. void FixedUpdate()
2.   {
3.   FSMFixedUpdate();
4.   }

This was all working fine yesterday, then I change out the scene and all of my assets for something other than a cylinder and it all goes to heck! Haha

Any ideas?

 

hazard a guess

GameObject.FindGameObjectWithTag("Player");

is not working as you expect

 

That would not make a difference.

It's just weird because this was working as intended before switching out the 3D assets used.

I have high doubts that changing the asset that this component as attached to would make much difference as it was just a Unity Primitive Capsule. Nothing special about it.

 

Its Tag makes all the difference in the world, considering that's what you're looking for.

 

Exhibit #342 why tags suck and should just be avoided.

 

They suck for finding specific things sure. However, they are useful for figuring out what something is once you've already found it.

An example - we do line of sight checks from unit to unit. Map props don't break line of sight but buildings do. We do a layer-specific raycast and then check all the things returned by that raycast to see if anything is tagged as a prop.

 

BMRX, NullReferenceException is telling you that your code tried to "dot" something that was null. i.e.,

Code (csharp):

1. var myThing = null;
2. myThing.DoSomething();
3. myThing.Property = 0;

Both lines 2 and 3 will give a NullReferenceException, so that's why James suggests your FindGameObjectByTag is not working as you expect.

Consider this line: 34, where the error is happening ...

Code (csharp):

1. playerTransform = objPlayer.transform;

The code is "dotting" objPlayer and throwing a NullReferenceException. This means objPlayer is null.

 

lol wouldnt make a difference he says.

obviously you have no f***** idea, so ill just leave you to it.

 

Put a breakpoint on the FindObjectWithTag() call, see what it returns.

If it is non-null and later becomes null, turn it into a simple property with get/setters, put a breakpoint in the setter, and see who is poking it to null.

 

Not sure what has crawled up your ass, I was neither rude or insulting to you. I did not question your intelligence or call you out as someone talking out of their ass.

That said your suggestion is neither constructive nor helpful. You have not presented a "why" that would not be working as intended, as I had previously stated I have everything setup the exact same way it was before. Nothing has changed, as such I have no reason to believe that your "hazard guess" can lead me to any sort of conclusive results.

If you wish to be helpful to people why not present your suggestions in a more clear way? Your elitist attitude is less than desirable.

EDIT/

I thank everyone for their help... It has randomly decided to start working again.

How did I solve this problem? No idea. G'day

 

If you write that you changed nothing and then you write, it worked before you switched out the 3d assets is kind of irritating. It doesn't matter what you changed, but the fact that you changed something matters a lot!
It seems that you replaced your player in some way and you forgot the "Player" tag. Your code expects this tag, but it is most likely not finding it, which then leads to those errors, because no player could be found and you still try to perform actions with it.

 

I suspect it was something along those lines, yet during this initial problem I had gone over every thing I could think of. Which is what led to this post.

The odd thing is that I started up Unity tonight and it just started working. Again, I changed nothing. Sorry if that is irritating but that's the best way to describe it.