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ReadPixels was called to read pixels from system frame buffer

The question from the unity of official in China.

ReadPixels was called to read pixels from system frame buffer, while not inside drawing frame, UnityEngine.Testure2D;ReadPixels(Rect, Int32, Int32,Boolean) 

I searched Google, and founded a lot of people mentioning similar problems, but didn't find a solution.

Two of the same configuration computer, a successful compilation, the other has a problem. the same hardware, OS, license.