Hey Sergi,
It seems that the Windmill Wwise ID is not the same as what's selected on the game object. It shouldn't prevent you from continuing in the lessons, but here's how I would fix it:
- First, I'd delete the Wwise_IDs.h file (in the StreamingAssets > Audio > GeneratedSoundBanks folder) and then generate new SoundBanks + Wwise ID.
- If that doesn't work, go to the Windmill game object in the Hierarchy, and reselect the Ambient_Windmill Event in the AkEvent, by first clicking Reset and then select it again.
That said, since it's not really preventing you from continuing in the certification, you could also just delete the Windmill game object.
Hope it helps!