_FluidDepthTexture not found

[asimofu_ok]

When I play the Obi Fluid example scene, it makes this caution.

CommandBuffer: temporary render texture _FluidDepthTexture not found while executing Render fluid (SetGlobalTexture)

Some of examples seems not rendering fluid particles(MultiphaseFluidBuoyancy.unity and SimpleFluid.unity)
And in all example scene, its not rendering fluid particles in Scene View.
I use Unity2018.2.5f1 with Win10.