Cannot subscribe for events

Hello, It's my first mod and I'm struggling to subscribe at certain events (only cpw.mods.fml.common.gameevent ?), maybe I didn't understand something.

So in my main mod class, in FMLPreInitializationEvent  : 

MinecraftForge.EVENT_BUS.register(new EventsHandler());

In my EventsHandler class :

public class EventsHandler {

	@SubscribeEvent
	public void onItemPickup(ItemPickupEvent e) {
		FirstMod.instance.logger.log(Level.INFO, "test pickup");
	}
	
	@SubscribeEvent
	public void onItemPickup2(EntityItemPickupEvent e) {
		FirstMod.instance.logger.log(Level.INFO, "test pickup2");
	}
}

On an item pickup i successfully get the "test pickup2" message, but not the first one from the ItemPickupEvent.

I tested others events and it seems like it doesn't work with all fml game events.

Thanks in advance.