Try :
function startbank ()
setElementData ( source, "bankrobber", true )
exports ["guimessages"] : outputServer ( source, "You start bank rob!" , 255, 255, 0)
exports ["guimessages"] : outputServer ( source, "You must stay in bank 5 minutes to get money!" , 255, 255, 0)
setElementInterior ( source, 3, 387.6708, 173.8050, 1008.3893 )
setPlayerWantedLevel ( source, 6 )
bankTimer = setTimer (function(player)
if not isElement(player) then return end
givePlayerMoney ( player, 50000 )
removeElementData( player, "bankrobber" )
exports ["guimessages"] : outputServer ( player, "You successfully robbed the bank and get $50000!" , 255, 255, 0)
end ,10000,1,source)
end
addEvent ( "start", true )
addEventHandler ( "start", root, startbank )