2019.3.0a8 - bunch of HDRP 6.8.1 errors

Hi,

I just installed 2019.3.0a8 so that I could test the new HDR mode. But I receive these errors now:

Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3672,17): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3672,72): error CS0117: 'VFXManager' does not contain a definition for 'IsCameraBufferNeeded'
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3673,53): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3674,52): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3707,37): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3709,32): error CS0117: 'VFXManager' does not contain a definition for 'SetCameraBuffer'
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3709,65): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3712,37): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3714,32): error CS0117: 'VFXManager' does not contain a definition for 'SetCameraBuffer'
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3714,65): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3717,37): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3720,32): error CS0117: 'VFXManager' does not contain a definition for 'SetCameraBuffer'
Library\PackageCache\com.unity.render-pipelines.high-definition@6.8.1-preview\Runtime\RenderPipeline\HDRenderPipeline.cs(3720,65): error CS0234: The type or namespace name 'VFXCameraBufferTypes' does not exist in the namespace 'UnityEngine.Experimental.VFX' (are you missing an assembly reference?)

I also installed Visual Effect Graph 6.8.1 already.

Is a quick fix possible here?

Thanks