Help me - ElementData

[Hypnos]

My script have one error.

I'am starting a script and this error in debugscript;

Line 28: attemp to compare nil with number

exprequired = {} 
  
addEventHandler("onResourceStart", resourceRoot, 
function () 
for i, thePlayer in ipairs(getElementsByType("player")) do 
theAccount = getPlayerAccount(thePlayer) 
if (theAccount) and not (isGuestAccount(theAccount)) then 
file = xmlLoadFile("exp_oranlari.xml") 
for i, node in ipairs (xmlNodeGetChildren(file)) do 
EXPRequired = tonumber(xmlNodeGetAttribute(node, "EXPRequired")) 
table.insert(exprequired, EXPRequired) 
end 
experience = tonumber(getAccountData(theAccount, "experience")) 
experience_t = tonumber(getAccountData(theAccount, "experience_t")) 
setElementData(thePlayer, "experience", experience or 0) 
setElementData(thePlayer, "experience_r", tonumber(exprequired[level or 1])) 
end 
end 
end) 
  
addEventHandler("onElementDataChange", getRootElement(), 
function (dataName) 
if (getElementType(source) == "player") and (dataName == "experience") then 
theAccount = getPlayerAccount(source) 
if (theAccount) and not (isGuestAccount(theAccount)) then 
experience = getElementData(source, "experience") 
experience_r = getElementData(source, "experience_r") 
if (experience >= tonumber(experience_r)) then 
.... 

Help me

[Walid]

Try this

addEventHandler("onElementDataChange", getRootElement(), 
function (dataName) 
    if (getElementType(source) == "player") and (dataName == "experience") then 
        local theAccount = getPlayerAccount(source) 
        if (theAccount) and not (isGuestAccount(theAccount)) then 
        local experience = getElementData(source, "experience") or 0 
        local experience_r = getElementData(source, "experience_r") or 0 
        if (experience >= tonumber(experience_r)) then 
        -- Your code here  
        end  
        end  
        end  
    end  
)