SteamVR External Camera, Screen Position out of view frustum - unity3d

I am currently working on SteamVR External Camera for the third controller, supporting Mixed Reality in my project for HTC Vive.
But I have a trouble with the Quadratic view, it shows only the HMD:
When I select the camera in the child of third controller, It gives this error :
My hunch for this problem is because the Graphics.drawTexture() in the script, but I don't know the solution for it. I have searched this problem at Unity Forum but no answer there...
Any help will be appreciated.
Notes :
Unity v5.6.1f1
SteamVR v1.2.1

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