Mmmm, not so easy....

I wrote this in the story _GLO_Shovel ('init' part):

DB_ShovelArea (TRIGGERGUID_BoxTrigger_000_1263fd7f-b35b-48cc-b072-9e5eadf6fc24, "GameMaster_Chest_Used", ITEMGUID_Dirtpile_45562603-508c-46e2-a7db-d1fb825f7a5f);
DB_ShovelRewardItemAppear ("GameMaster_Chest_Used", ITEMGUID_Chest_1e31de6a-ebfa-4f62-9511-dc64815114a4, TRIGGERGUID_BoxTrigger_000_1263fd7f-b35b-48cc-b072-9e5eadf6fc24);

But nothing appen when I try to use the dirtpile.
But the console say that:

"Constant in script for unknown object is invalid, item with handle 'e63f9ee3-59dd-40db-9118-973924ab2bad' doesn't exist"

... I don't understand why...