Signature of the delegate to bind to the OnRequestFinished event of the Path Following Component of the AI controller

Development Programming & Scripting
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I need to bind a callback to the OnRequestFinished event of the AI controller after the AI arrives its destination. I declare the callback UFunction with the following signature:

void OnMoveCompleted(FAIRequestID RequestID, const FPathFollowingResult& Result);

But during compiling I got the following error message:

Unable to find ‘class’, ‘delegate’, ‘enum’, or ‘struct’ with name ‘FPathFollowingResult’

I already include the header:

include “Navigation/PathFollowingComponent.h”

So what’s wrong with the signature?