Object reference not set to an instance of an object

I'm trying to just setup a basic quad, I've found this code

voidStart () {
//Createaonepixeltexturewiththerightcolor
varcolor = Color.red;
intframeWidth = 10;
Rectarea = newRect (Screen.height / 2, Screen.width / 2 + Screen.width / 8, 580, 64);

vartexture = newTexture2D(1, 1);
texture.SetPixel(0, 0, color);
texture.Apply();

RectlineArea = area;
lineArea.height = frameWidth; //Topline
GUI.DrawTexture(lineArea, texture);
lineArea.y = area.yMax - frameWidth; //Bottom
GUI.DrawTexture(lineArea, texture);
lineArea = area;
lineArea.width = frameWidth; //Left
GUI.DrawTexture(lineArea, texture);
lineArea.x = area.xMax - frameWidth;//Right
GUI.DrawTexture(lineArea, texture);
}

But it's giving me this error

NullReferenceException: Object reference not set to an instance of an object
UnityEngine.GUI.DrawTexture (Rect position, UnityEngine.Texture image, ScaleMode scaleMode, Boolean alphaBlend, Single imageAspect)
UnityEngine.GUI.DrawTexture (Rect position, UnityEngine.Texture image)
SetupQuad.Start () (at Assets/SetupQuad.cs:19)

 

According to that message the error is happening on line 19. Which line is that?

 

It's the first GUI.DrawTexture(lineArea, texture);

I'm using Unity on a Mac and everytime I try to debug to see the variables using Monodevelop, monodevelop crashes which isn't helping.

 

There probably isn't an actual texture there then. Try creating an image and importing it then making that variable public and putting the image in the box that comes up in the editor. It doesn't need to be anything fancy; a 1x1 white pixel of an image will do. My guess is that it's trying to read an image but there isn't one there.

 

I thought the line var texture = newTexture2D(1, 1); created a new blank texture?

All I'm trying to do is create a blank (of a certain color) quad to appear.

 

I feel like a dummy, the other thing I didn't notice was that you're using old GUI stuff in Start(). You can't do that. Legacy GUI stuff needs to be in OnGui(). It also looks like you aren't creating lineArea anywhere.

 

I got the code from here http://answers.unity3d.com/question...d-rectangle.html?page=2&pageSize=5&sort=votes

If that code is out of date can you point me in the direction of some that isn't? I just want to run the code and have a simple 1 colour quad appear (in 2d) on the screen.

 

Put the GUI calls in OnGui. That's legacy GUI, though. It would be good programming practice, however, for you to look at the new GUI documentation and figure out how to generate the texture and apply it to a GUI image on your own.