Converting “Render Target 2D” to “Texture 2D”

Development Rendering
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I wrote a blueprint function library code for my game that converts “Render Target 2D” to “Texture2D” object. It works correctly in editor mode but not in standalone mode. How can I solve this problem.
This is the code I used:

 if (!RenderTarget) return nullptr;


 FTextureRenderTargetResource* RTResource = RenderTarget->GameThread_GetRenderTargetResource();
 FReadSurfaceDataFlags ReadPixelFlags(RCM_UNorm);
 ReadPixelFlags.SetLinearToGamma(false);

 TArray<FColor> OutBMP;
 RTResource->ReadPixels(OutBMP, ReadPixelFlags);

 UTexture2D* Texture = UTexture2D::CreateTransient(RenderTarget->SizeX, RenderTarget->SizeY);
 if (!Texture) return nullptr;

 void* TextureData = Texture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
 FMemory::Memcpy(TextureData, OutBMP.GetData(), OutBMP.Num() * sizeof(FColor));
 Texture->PlatformData->Mips[0].BulkData.Unlock();

 Texture->UpdateResource();

 return Texture;