Error at Chroma Keying with media

Attempting to synthesize using images succeeds in an empty level file, but attempting to apply the chroma key color in a level studio that creates a virtual studio results in the following error and the engine is turned off. I need your help me.

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Assertion failed: LockedData.bLocked == false [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/D3D12RHI/Private/D3D12Buffer.cpp] [Line: 289]

UE4Editor_Core
UE4Editor_Core
UE4Editor_D3D12RHI
UE4Editor_Renderer
UE4Editor_Renderer
UE4Editor_Renderer
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
kernel32
ntdll