Error when I load a map using the unreal editor for fortnite

When I load the grid island map or any map the unreal editor for fortnite crashes and I get this error
Fatal error: [File:D:\build++Fortnite\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 261]
D3DRHI->GetDevice()->CreateRenderTargetView(BackBufferResource, &RTVDesc, BackBufferRenderTargetView.GetInitReference()) failed with error E_INVALIDARG
at D:\build++Fortnite\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Viewport.cpp:161
how do I fix it?