[HELP] Dayz errors:

[s1mple]

WARNING: [DayZ-MTA]\DayZ\login.lua:468: Bad argument @ 'getAccountData' [Expected account at argument 1, got boolean] 

http://prntscr.com/af6776 IMAGE

How to fix it?

[1LoL1]

Post the code and wrong section.

[s1mple]

function createVehicleOnServerStart() 
    local vehicleManager = getAccount("getAccountsBySerial","ds4f9$") 
    for i = 1, (getAccountData(vehicleManager,"getAccountsBySerial") or 0) do 
        wastedVehicle = false 
        vehicle = getAccount("vehicle_number_"..i,"ds4f9$") 
        if not vehicle then break end 
        if getAccountData(vehicle,"isExploded") == true then 
            setAccountData(vehicle,"health",1000) 
            wastedVehicle = true 
        end 

I post full functioni but

    for i = 1, (getAccountData(vehicleManager,"getAccountsBySerial") or 0) do 
        wastedVehicle = false 

have problem