Material not rendered on iOS devices

The material in the project Stylized Rendering M_Terrain_Ground_A is not available on iOS device. I tried to solve the problem by reading Materials for Mobile Platforms, which is: Materials for Mobile Platforms | Unreal Engine Documentation
But that doesn’t seem to provide any way to solve the current problem. In the log it just simply reported that it failed to compile material for OpenGL ES, default material will be used.
Any help means a lot. Thx.