error in console

[ugurdrahs]

error:

[2:47:18.499] [Error - CreatureScript Interface]
[2:47:18.499] data/creaturescripts/scripts/amiroslo.lua:onDeath
[2:47:18.499] Description:
[2:47:18.499] (luaGetThingPosition) Thing not found

[2:47:18.500] [Error - CreatureScript Interface]
[2:47:18.500] data/creaturescripts/scripts/amiroslo.lua:onDeath
[2:47:18.500] Description:
[2:47:18.500] data/lib/032-position.lua:2: attempt to index local 'position' (a boolean value)
[2:47:18.500] stack traceback:
[2:47:18.500]   data/lib/032-position.lua:2: in function 'isInRange'
[2:47:18.500]   data/creaturescripts/scripts/amiroslo.lua:8: in function <data/creaturescripts/scripts/amiroslo.lua:7>

creaturescript/amiroslo.lua

local warArea = {
fromPosition = {x = 31449, y = 31071, z = 7},
toPosition = {x = 31463, y = 31080, z = 7}
}


function onDeath(cid, target)
if isInRange(getCreaturePosition(cid), warArea.fromPosition, warArea.toPosition) and isInRange(getCreaturePosition(target), warArea.fromPosition, warArea.toPosition) then
if getPlayerLevel(cid) > getPlayerLevel(target) then
doPlayerAddExperience(cid, 1000) --change exp
else
doPlayerAddExperience(cid, 0)
end
end
return true
end

lib/032-position.lua

function isInRange(position, fromPosition, toPosition)
	return position.x >= fromPosition.x and position.y >= fromPosition.y and position.z >= fromPosition.z and position.x <= toPosition.x and position.y <= toPosition.y and position.z <= toPosition.z
end

function getDistanceBetween(fromPosition, toPosition)
	local x, y = math.abs(fromPosition.x - toPosition.x), math.abs(fromPosition.y - toPosition.y)
	local diff = math.max(x, y)
	if(fromPosition.z ~= toPosition.z) then
		diff = diff + 9 + 6
	end

	return diff
end

function getDirectionTo(pos1, pos2)
	local dir = NORTH
	if(pos1.x > pos2.x) then
		dir = WEST
		if(pos1.y > pos2.y) then
			dir = NORTHWEST
		elseif(pos1.y < pos2.y) then
			dir = SOUTHWEST
		end
	elseif(pos1.x < pos2.x) then
		dir = EAST
		if(pos1.y > pos2.y) then
			dir = NORTHEAST
		elseif(pos1.y < pos2.y) then
			dir = SOUTHEAST
		end
	else
		if(pos1.y > pos2.y) then
			dir = NORTH
		elseif(pos1.y < pos2.y) then
			dir = SOUTH
		end
	end

	return dir
end

function getCreatureLookPosition(cid)
	return getPositionByDirection(getThingPosition(cid), getCreatureLookDirection(cid))
end

function getPositionByDirection(position, direction, size)
	local n = size or 1
	if(direction == NORTH) then
		position.y = position.y - n
	elseif(direction == SOUTH) then
		position.y = position.y + n
	elseif(direction == WEST) then
		position.x = position.x - n
	elseif(direction == EAST) then
		position.x = position.x + n
	elseif(direction == NORTHWEST) then
		position.y = position.y - n
		position.x = position.x - n
	elseif(direction == NORTHEAST) then
		position.y = position.y - n
		position.x = position.x + n
	elseif(direction == SOUTHWEST) then
		position.y = position.y + n
		position.x = position.x - n
	elseif(direction == SOUTHEAST) then
		position.y = position.y + n
		position.x = position.x + n
	end

	return position
end

function doComparePositions(position, positionEx)
	return position.x == positionEx.x and position.y == positionEx.y and position.z == positionEx.z
end

function getArea(position, x, y)
	local t = {}
	for i = (position.x - x), (position.x + x) do
		for j = (position.y - y), (position.y + y) do
			table.insert(t, {x = i, y = j, z = position.z})
		end
	end

	return t
end

function Position(x, y, z, stackpos)
	local position = {x = 0, y = 0, z = 0}
	if(isNumeric(x .. y .. z)) then
		position = {x = x, y = y, z = z}
		if(isNumeric(stackpos)) then
			position.stackpos = stackpos
		end
	end

	return position
end

Thanks in advance!