Solved Problem with Gold Nuggets PLEASe Help

[jakehop22]

Please if anyone can help, help! ++REP if helped.
I keep getting this error in my server (GUI version) of TFS 0.3.6 p1.

[30/06/2010 13:27:40] [Error - Action Interface] 
[30/06/2010 13:27:40] data/actions/scripts/other/changegold.lua
[30/06/2010 13:27:40] Description: 
[30/06/2010 13:27:40] data/actions/scripts/other/changegold.lua:13: table index is nil
[30/06/2010 13:27:40] [Warning - Event::loadScript] Cannot load script (data/actions/scripts/other/changegold.lua)

This is what I have in changegold.lua:

local coins = {
	[ITEM_GOLD_COIN] = {
		to = ITEM_PLATINUM_COIN, effect = TEXTCOLOR_YELLOW
	},
	[ITEM_PLATINUM_COIN] = {
		from = ITEM_GOLD_COIN, to = ITEM_CRYSTAL_COIN, effect = TEXTCOLOR_LIGHTBLUE
	},
	[ITEM_CRYSTAL_COIN] = {
		from = ITEM_PLATINUM_COIN, effect = TEXTCOLOR_TEAL
	},
	[ITEM_GOLD_NUGGET] = {
		from = ITEM_CRYSTAL_COIN, effect = TEXTCOLOR_SILVER
	}
}

function onUse(cid, item, fromPosition, itemEx, toPosition)
	if(getPlayerFlagValue(cid, PLAYERFLAG_CANNOTPICKUPITEM)) then
		return false
	end

	local coin = coins[item.itemid]
	if(not coin) then
		return false
	end

	if(coin.to ~= nil and item.type == ITEMCOUNT_MAX) then
		doChangeTypeItem(item.uid, item.type - item.type)
		doPlayerAddItem(cid, coin.to, 1)
		doSendAnimatedText(fromPosition, "$$$", coins[coin.to].effect)
	elseif(coin.from ~= nil) then
		doChangeTypeItem(item.uid, item.type - 1)
		doPlayerAddItem(cid, coin.from, ITEMCOUNT_MAX)
		doSendAnimatedText(fromPosition, "$$$", coins[coin.from].effect)
	end
	return true
end

This is what I have in actions.xml for changing gold:

	<!-- Change gold -->
	<action itemid="2148" event="script" value="other/changegold.lua"/>
	<action itemid="2152" event="script" value="other/changegold.lua"/>
	<action itemid="2157" event="script" value="other/changegold.lua"/>
	<action itemid="2160" event="script" value="other/changegold.lua"/>

This is what I have in items.xml for Gold Nugget:

	<item id="2157" article="a" name="gold nugget" plural="gold nuggets">
		<attribute key="weight" value="10" />
		<attribute key="worth" value="1000000" />
	</item>

I followed this tutorial (Sorry for posting link to another site):
LUA-NEW!-Money-ivory-coins

Please can anyone help me!? ++REP if helped.
Thanks.