warpPedIntoVehicle return false

[Sasu]

function montar() 
    warpPedIntoVehicle(conductor, carro) 
    outputChatBox(tostring(source)..", "..getPlayerName(source) or "Failed!!", root) 
    try = warpPedIntoVehicle(source, carro, 4) 
    outputChatBox(tostring(try), root) 
    triggerClientEvent("startTravel", root, conductor) 
end 
addEvent("subirPlayer", true) 
addEventHandler("subirPlayer", root, montar) 

I have this function that is trigger when I press a button. But for any reason the warpPedIntoVehicle in line 4 returns me false. I cant warp the player to the carro who is defined with createVehicle. The warpPedIntoVehicle in line 2 works perfectly. Why the other dont work?

[50p]

Because you have to know what is source.

[Sasu]

source is the localPlayer

triggerServerEvent("subirPlayer", localPlayer) 

And in the line 3, I check that the player "source" is correctly.

[50p]

Ok, then there is no seat 4. Use seat 3 instead because seat numbers start from 0 = driver.