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Fatal error packaging, im crying so much

Can someone please help me, I keep getting fatal errors whenever I run my packaged projects in development and shipping. Please can someone help me I am in so many tears right now!

For development:
Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp] [Line: 836]
Rendering thread exception:
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
0x00007ff89913d759 KERNELBASE.dll!UnknownFunction []
For shipping:
LowLevelFatalError [File:Unknown] [Line: 836]
Rendering thread exception:
LowLevelFatalError [File:Unknown] [Line: 249]
Result failed
at D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:368
with error DXGI_ERROR_INVALID_CALL

0x00007ff89913d759 KERNELBASE.dll!UnknownFunction []