LogPlatformFile: Not using cached read wrapperLogTaskGraph: Started task graph - Pastebin.com I get the error Unknown error twice and also LogD3D11RHI: Error: D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:(244): BackBuffer->GetResource() has 2 refs, expected 1