More scripting errors. Please help!

[palistov]

Callback functions for item use on an entity require two parameters. Your function KeyOnDoor will need a second parameter. The first is the item reference (which item was used by the player), while the second is the entity reference (the entity the item was used on). Change your parameters -- the statements in the parenthesis directly following your function name (in this case, it is KeyOnDoor) -- to reflect this.