Why GetWorld()->GetTimerManager().SetTimer doesn't work?

Development Programming & Scripting C++
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1

I want to create a Timer, but when I try to make it with GetWorld() it tells me that it is an incomplte class?
I’ve included the Header Engine/World.h but nothing happens, also UE4 tells me that there is no fail, I don’t know why it doesn’t work, please help me! : )

2

do you get any compile errors?