Fatal crash, even after verifying, deleting all files and re-install

[Spaceaids]

Fatal error: [File:unknown] [Line 684]
SwapChain1 ->ResizeBuffers (NumBackBuffers, SizeX, SizeY, GetRenderTargetFormat(PixelFormat), SwapChainFlags) failed at
E:/UE437P/Engine/Source/Runtime/D3D12RHI/Private/Windows/WindowsD3D12Viewport.ccp:411 with error DXGI_ERROR_INVALID_CALL Num=3, Size=(2560, 1440), PF=18, DXGIFormat=0x18, Flags=0x802

[*Morri*]

If updating the drivers of your graphics card doesn't help, then change the ingame rendering to DX11 instead of DX12:

ingame settings - graphics - rendering mode - DX11 (Don't forget to accept changes at the bottom)
or if the game doesn't start at all, force it through launch parameter: in your Steam library, right click on Medieval Dynasty in the list, go to "Properties" and in 'general' under the "Launch Options" window add: -dx11

Does that fixes the crashes?