Object Reference Not Set to Instance of An Object

I am fairly new to unity, so I am using one of unity's tutorial projects, karting. I am getting a NullReferenceException error after adding multiplayer into the game using pun 2.

This is the exact error:

NullReferenceException: Object reference not set to an instance of an object
KartGame.KartSystems.KartMovement.get_LocalSpeed () (at Assets/Karting/Scripts/KartSystems/KartMovement/KartMovement.cs:109)
KartGame.KartSystems.EngineAudio.Update () (at Assets/Karting/Scripts/KartSystems/KartAudio/EngineAudio.cs:67)

The two lines it points to are

Code (CSharp):

1. public float LocalSpeed => (Quaternion.Inverse (m_Rigidbody.rotation) * Quaternion.Inverse (m_DriftOffset) * m_Velocity).z;

and

Code (CSharp):

1. RPM = m_KartInfo.LocalSpeed / m_KartInfo.CurrentStats.topSpeed;

Any help would be greatly appreciated!

 

You can't initialize class-level variables with objects such as m_Rigidbody, because they don't (necessarily) exist at constructor time.

Put the intializer into either

Awake()

or

Start()

instead. It's a necessary pattern in Unity because the constructor code is not run on the main thread, and hence does not have access to mainline Unity stuff, even if it did already exist.

Monobehaviors have a very specific lifecycle and you can read more about it here:

https://docs.unity3d.com/Manual/ExecutionOrder.html