cast RenderTarget to Texture2D got crashed

Development Programming & Scripting C++
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1

I want to wirte widget to render target by WidgetRenderer->DrawWidget, then transform the render target to texture2D. But when the program run to RenderTarget->ConstructTexture2D，unreal engine got crashed.
Here is some of my code:

UTexture2D* UMainObject::RenderUIToTexture(const FString& Title, const FString& Text)
{
  
    UTextureRenderTarget2D* RenderTarget = NewObject<UTextureRenderTarget2D>();
    RenderTarget->InitAutoFormat(128, 128);

    
	TSharedPtr<SMarkWidget> SlateWidget = SNew(SMarkWidget).Title(Title).Text(Text);


	FWidgetRenderer* WidgetRenderer = new FWidgetRenderer(true);


	FVector2D DrawSize(128, 128);

	WidgetRenderer->DrawWidget(
		RenderTarget,
		SlateWidget->AsShared(),
		1.0,
		DrawSize,
		FApp::GetDeltaTime(),
		true);

	UTexture2D* Texture2D = nullptr;

    RenderTarget->ConstructTexture2D(Texture2D, "texture", EObjectFlags::RF_NoFlags, CTF_DeferCompression);
    RenderTarget->CompressionSettings = TextureCompressionSettings::TC_VectorDisplacementmap;
#if WITH_EDITORONLY_DATA
    Texture2D->MipGenSettings = TextureMipGenSettings::TMGS_NoMipmaps;
#endif
    Texture2D->SRGB = 1;
    Texture2D->UpdateResource();

	return Texture2D;
}

Anything i can do to fix the crash?