NullReferenceException when Loading scene

Hi,

First, please check the screenshot of my editor below.

In my project I have 3 scenes: a main menu with a simple camera and 2 scenes with the PlayerVR2 prefab.
This prefab has a child "SMI_CameraWithEyeTracking" with a SMI Eye Tracking Unity component. This SMI component is an imported dll.
The screenshot is what happens when I try to load a scene with SMI for the 2nd time. The first scene works fine but even if I reload the same one it causes this issue.

The issue is as you can see a triple NullReferenceException error, all of them refering to the PlayerVR2 prefab and its 2 children, all of them calling the SMI script at one point.

Do you have an idea of what causes this issue?

If you need anything please let me know.

Thanks a lot!

 

Yes, you have a null reference. Since it's not really possible to know without seeing a script and a copy of the error (copied and not a screenshot) it's hard for us to tell you where. But the good thing about this error is it will tell you what script and which line. Usually you can also double click the error for it to take you to the line. Then you just have to ask yourself, what can be null on this line.

If you aren't sure, start sticking debug.log stuff printing out the value of each possible null object (this can help narrow it down if you have multiple possible null objects)

 

Here are the 3 errors

Every line numbered contains a function from the SMI script accessible by the SMI component attached to the PlayerVR2's child.

This is what I use to fetch the SMI script in a script attached to the PlayerVR2 gameobject:

Code (CSharp):

1.  
2. //SMICamGO is the gameobject containing the SMI script
3. public GameObject SMICamGO;
4.     public SMI.SMIEyeTrackingUnity smiInstance;
5.  
6.     // Use this for initialization
7.     void Start () {
8.             smiInstance = SMICamGO.transform.GetComponent<SMIEyeTrackingUnity> ();

from there, I call the instance in the script like I did in the LookPR one (3rd error):

Code (CSharp):

1.  SMI_GazeObject = smiInstance.smi_GetGazedObject();

 

All three errors end here

SMIGazeController.smi_getRayFromGaze ()

So you are getting some null reference in that method.