I solved my problem by changing the code source of UTimelineComponent
instead of
UCLASS(MinimalAPI)
class UTimelineComponent : public UActorComponent
{
I’ve marked the entire class to be exported
UCLASS()
class ENGINE_API UTimelineComponent : public UActorComponent
{
And now, no more unresolved external in Editor configuration.
I think this class should be entirely exported rather than only function marked with ENGINE_API.
Could you ask to change this in the code for the next version ?
D.