Lua Errors in console

[Eraghon]

Hi, i have got problem

[Error - CreatureScript Interface] 
data/creaturescripts/scripts/think.lua:onThink
Description: 
(luaGetCreatureStorage) Creature not found

[Error - CreatureScript Interface] 
data/creaturescripts/scripts/think.lua:onThink
Description: 
(luaGetTileInfo) Tile not found

[Error - CreatureScript Interface] 
data/creaturescripts/scripts/think.lua:onThink
Description: 
data/creaturescripts/scripts/think.lua:11: attempt to index a boolean value
stack traceback:
	data/creaturescripts/scripts/think.lua:11: in function <data/creaturescripts/scripts/think.lua:1>

creaturescripts/scripts/think.lua

function onThink(cid, interval)
	local position = getCreaturePosition(cid)
	
	local posx = getPlayerStorageValue(cid,53451)
	local posy = getPlayerStorageValue(cid,53452)
	local posz = getPlayerStorageValue(cid,53453)

	if not(getTileThingByPos(position)) then
	print("Missing ground.")
	else
	if getTileInfo(position).protection and isPlayerPzLocked(cid) then
	db.executeQuery("INSERT INTO `z_bugs` VALUES (NULL, "..getPlayerGUID(cid)..", "..(position.x)..", "..(position.y)..","..(position.z)..",0)")

	doTeleportThing(cid,{x=posx,y=posy,z=posz}, TRUE)
	doCreatureSay(cid,'There is Protection Zone and you`re PZ-LOCKED.',TALKTYPE_ORANGE_1)
	doPlayerSendTextMessage(cid,MESSAGE_STATUS_WARNING,'[Server] WARNING! You will get BAN if you continue attempting to Protection Zone with PZ-LOCK!')
	end
        end
end

Please help