如何在Xcode8上清除这些警告？

Question

最近,我将我的项目提交到Swift3.0.并修复Xcode8.0上的升级问题.一些奇怪的警告消息显示在Xcode7中不会发生.

Painter Z index: 1023 is too large (max 255)
Painter Z index: 1023 is too large (max 255)
Painter Z index: 1023 is too large (max 255)
Painter Z index: 1023 is too large (max 255)
Painter Z index: 1023 is too large (max 255)
Painter Z index: 1023 is too large (max 255)
ERROR /BuildRoot/Library/Caches/com.apple.xbs/Sources/VectorKit_Sim/VectorKit-1228.30.7.17.9/GeoGL/GeoGL/GLCoreContext.cpp 1763: InfoLog SolidRibbonShader:
ERROR /BuildRoot/Library/Caches/com.apple.xbs/Sources/VectorKit_Sim/VectorKit-1228.30.7.17.9/GeoGL/GeoGL/GLCoreContext.cpp 1764: WARNING: Output of vertex shader 'v_gradient' not read by fragment shader 

任何专家都知道如何解决它？先谢谢你.