Lua Destroy field error, 8.5

[Bam]

The error

[11/08/2009 16:03:09] attempt to index a nil value
[11/08/2009 16:03:09] stack traceback:
[11/08/2009 16:03:09] 	[C]: in function 'isInArray'
[11/08/2009 16:03:09] 	data/spells/scripts/support/destroy field rune.lua:6: in function <data/spells/scripts/support/destroy field rune.lua:1>
[11/08/2009 16:03:09] 	(tail call): ?

This is the script

local function doRemoveField(cid, pos)
	pos.stackpos = 254
	local field = getThingfromPos(pos)
	local playerPos = getPlayerPosition(cid)

	if(field.uid > 0 and isInArray(FIELDS, field.itemid) == TRUE) then
		doRemoveItem(field.uid)
		doSendMagicEffect(pos, CONST_ME_POFF)
		return LUA_NO_ERROR
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(playerPos, CONST_ME_POFF)
	return LUA_ERROR
end

function onCastSpell(cid, var)
	local pos = variantToPosition(var)
	if(pos.x ~= 0 and pos.y ~= 0 and pos.z ~= 0) then
		return doRemoveField(cid, pos)
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(getPlayerPosition(cid), CONST_ME_POFF)
	return LUA_ERROR
end

Please help

 

[Metor]

local function doRemoveField(cid, pos)
	pos.stackpos = 254
	local field = getThingfromPos(pos)
	local playerPos = getPlayerPosition(cid)

	if(field.uid > 0 and isInArray(FIELDS, field.itemid)) then
		doRemoveItem(field.uid)
		doSendMagicEffect(pos, CONST_ME_POFF)
		return LUA_NO_ERROR
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(playerPos, CONST_ME_POFF)
	return LUA_ERROR
end

function onCastSpell(cid, var)
	local pos = variantToPosition(var)
	if(pos.x ~= 0 and pos.y ~= 0 and pos.z ~= 0) then
		return doRemoveField(cid, pos)
	end

	doPlayerSendDefaultCancel(cid, RETURNVALUE_NOTPOSSIBLE)
	doSendMagicEffect(getPlayerPosition(cid), CONST_ME_POFF)
	return LUA_ERROR
end

Take this

 

[Bam]

Still doesnt work

 

[Bam]

Still need help

 

[GMBear]

Hmm dont work for me either ill look around