Solved check if item was taken (chest)

Hey! How can I check if someone take a item from a chest? For example if a player take a stick from chest and he get a message like "You took a stick from a chest!"..Thanks!

InventoryTransactionEvent

But how can I get the player?

Here:
https://forums.pocketmine.net/threads/undefined-method.17102/

Thanks! Danke <33