Help Please with Scripting

[SilentStriker]

Try renaming the key to StudyKey_1 in both the name and the CustomSubItemName and then change

AddUseItemCallback("", "key_1", "level_celler_1", "UnlockLevelDoor", true);

to

AddUseItemCallback("", "StudyKey_1", "level_celler_1", "UnlockLevelDoor", true);