RenderTexture usage for camera screenshot

I'm having some problems using RenderTexture in the editor and on the device (ios). I am trying to get a screenshot from only a camera. In the editor, the image gets messed up and on the device i get a black texture and this error:

OpenGLES error 0x0502 in /Users/.../GlesHelper.mm:262

Here is the code:

Code (csharp):

1.  
2.     yield return new WaitForEndOfFrame(); // this also captures gui, remove if you don't wanna capture gui
3.        
4.                 RenderTexture rt = new RenderTexture(Screen.width, Screen.height , 24 , RenderTextureFormat.ARGB32);
5.             rt.useMipMap = false;
6.         rt.antiAliasing =1;
7.         RenderTexture.active = rt;
8.         Camera.main.targetTexture = rt;
9.        
10.        
11.         Texture2D shot = new Texture2D(Screen.width,Screen.height,TextureFormat.ARGB32,false);
12.            
13.    
14.         Camera.main.Render();
15.            
16.         shot.ReadPixels(new Rect(0,0,Screen.width,Screen.height),0,0,false);
17.                 shot.Apply();
18.            
19.         Camera.main.targetTexture = null;
20.                 RenderTexture.active = null;
21.         Destroy(rt);
22.  
23.                GameObject.Find("PlaneTest").renderer.material.mainTexture = shot;
24.        
25.    

The code is called on a press event.
What am i doing wrong?

 

i've changed a bit of the code, but the problem was from the camera. The clear flag was set to Don't clear instead of Depth only