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[Amine#TN]

addEventHandler("onResourceStart", getResourceRootElement(getThisResource()),
    function()
            exports [ "scoreboard" ]:addScoreboardColumn ( "Vehicle:", 3 )
    end
)
 
setTimer ( function ( )
 local players = getElementsByType "player"
    for k, v in ipairs ( players ) do
        if ( isPedInVehicle(v) ) then
           local vehicle =  getPedOccupiedVehicle(v)
          local carname = getVehicleName(vehicle)
        setElementData ( v, "Vehicle:", tostring(carname) )
               else
        setElementData ( v, "Vehicle:", "On foot")
      end
    end
end, 2500, 0 )


------------
why this is not working

[pro-mos]

addEventHandler("onResourceStart", resourceRoot,
  function ()
    exports.scoreboard:scoreboardAddColumn('Vehicle:')
  end
)

setTimer(function ()
  local players = getElementsByType "player"
  for k, v in ipairs ( players ) do
    if ( isPedInVehicle(v) ) then
      local vehicle =  getPedOccupiedVehicle(v)
      local carname = getVehicleName(vehicle)
      setElementData ( v, "Vehicle:", tostring(carname) )
    else
      setElementData ( v, "Vehicle:", "On foot")
    end
  end
end, 2500, 0)

You had the function name wrong

[Amine#TN]

 thanx man it is workorking