Download

Error when running packaged project

When I run my packaged project this is what comes up:

Fatal error:
[File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Util.cpp] [Line: 249]
Result failed
at
D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:368
With error DXGI_ERROR_INVALID_CALL

Please can someone help me out, any help is much appreciated, thanks