[SceneKit] Error: Physically based lighting model is not supported

Hi,
I start reading “3D Apple Games by Tutorials” book. During executing all exercises I got messages in Xcode:

“[SceneKit] Error: Physically based lighting model is not supported by the OpenGL renderer, using Phong instead (2)”

What does it mean?

PS. I use MacOS 10.14.2 and Xcode 10.1

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@chrislanguage Can you please help with this when you get a chance? Thank you - much appreciated! :]

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