NullReferenceException

hello how can I fix the NullReferenceException: Object reference not set to an instance of an object, the error is in this line of code

touchCurrentRenderer.material.color = touchOriginalColor;

And below is my code

public GameObject SnapLocation;
public GameObject HoldObject;
public GameObject HighLightObject;
public bool isSnapped;
private bool objectSnapped;
private bool grabbed;
private Renderer touchCurrentRenderer;
private Color touchOriginalColor;
public Color touchHighlightColor;
public Renderer rend;
private void Start()
{

}
void Update()
{
grabbed = this.GetComponent<OVRGrabbable>().isGrabbed;
objectSnapped = SnapLocation.GetComponent<SnapToLocation>().Snapped;
Renderer rend = HighLightObject.GetComponent<Renderer>();
rend.enabled = false;
if (grabbed == true)
{
// Get Renderer component
touchCurrentRenderer = HighLightObject.GetComponent<Renderer>();
touchOriginalColor = touchCurrentRenderer.material.color;
// Highlight Object
touchCurrentRenderer.material.color = touchHighlightColor;
rend.enabled = true;
}
if (grabbed == false)
{
touchCurrentRenderer.material.color = touchOriginalColor;
rend.enabled = false;
}
if (objectSnapped == true)
{
GetComponent<Rigidbody>().isKinematic = true;
transform.SetParent(HoldObject.transform);
isSnapped = true;
}
if (objectSnapped == false && grabbed == false)
{
GetComponent<Rigidbody>().isKinematic = false;
}
}

 

Which line of code is giving error ?

It appears to be a missing component exception

 

this one
touchCurrentRenderer.material.color = touchOriginalColor;

 

What is "touchOriginalColor"?

It looks like you haven't defined this variable yet.

 

as I understand I did it in this line or not?

touchOriginalColor = touchCurrentRenderer.material.color;

 

Code (CSharp):

1.  
2. touchOriginalColor = touchCurrentRenderer.material.color;
3. touchCurrentRenderer.material.color = touchHighlightColor;
4.  

This isn't going to work - what do you have as the value of touchCurrentRenderer.material.color in Unity?

This is the most basic way of defining a colour in Unity:

Code (CSharp):

1.         Color newColor = new Color(0.3f, 0.4f, 0.6f, 0.3f);

 

Okay so at first I should define touchOriginalColor like this,

Color touchOriginalColor = new Color(0.3f, 0.4f, 0.6f, 0.3f);

and then do this code like this

touchOriginalColor = touchCurrentRenderer.material.color;

Am sorry I don't have that experience in coding

 

No it's because touchCurrentRenderer.material.color doesn't have a value.
It's like saying 'What is something?' and then answering 'it's that' - the person still doesn't know what it is.

Code (CSharp):

1.  
2. Color touchOriginalColor = new Color(0.3f, 0.4f, 0.6f, 0.3f);
3. touchCurrentRenderer.material.color = touchOriginalColor;

You can define all these and GetComponent stuff outside of Update so it's not looping over the lot, but it's probably not important here.

 

Ya because it still has the same problem when I tried it; a Null reference exception

 

Yes it has a color property