Dynamic delegate FOnTimelineFloat undefined

I can’t figure out why my

DECLARE_DYNAMIC_DELEGATE_OneParam( FOnTimelineFloat, float, Output );

won’t work eventhough I added the header file “Components/TimelineComponent.h” to my cpp.
I followed this wiki: Wiki Timeline

Compiler always crush. IntelliSense says, it’s undefined. Where is the problem? My cpp code is same as in the wiki. “FOnTimelineEventStatic” works.

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Hi did you happen to have already resolved this? Because it’s really weird and I encountered this too.