Ensure condition failed: Gameworks/Waveworks

I create a new c++ project with the UE4.15 gameworks/Waveworks source from GitHub and get execution breaks with the following messages- Can anybody help me?

Ensure condition failed: ColorBinding == EClearBinding::EColorBound [File:e:\unrealengine-waveworks\engine\source\runtime\rhi\public\RHI.h] [Line: 882]

UE4Editor.exe has triggered a breakpoint.

[2018.03.22-15.20.51:803][ 91]LogOutputDevice:Error: Ensure condition failed: ColorBinding == EClearBinding::EColorBound [File:e:\unrealengine-waveworks\engine\source\runtime\rhi\public\RHI.h] [Line: 882]
[2018.03.22-15.20.51:803][ 91]LogStats: FDebug::EnsureFailed - 0.000 s
Assertion failed: (*WaveWorksRT)->GetRenderTargetItem().TargetableTexture->GetClearColor() == FLinearColor::Black [File:E:\UnrealEngine-WaveWorks\Engine\Source\Runtime\Renderer\Private\PostProcess\SceneRenderTargets.cpp] [Line: 1368]

UE4Editor.exe has triggered a breakpoint.

UE4Editor.exe has triggered a breakpoint.

Best regards