Uknown Command

After add this code to the player.cs for dismount a vehicle.
function serverCmdsetPlayerControl(%client)
{
%client.setControlObject(%client.player);
}

function getOut()
{
commandToServer('setPlayerControl');
schedule(500,0,"jump","");
schedule(600,0,"jump","");
}

I get this in the console.

starter.fps/server/scripts/player.cs (722): Unknown command setObjectActiveImage
object LocalClientConnection (1603) GameConnection NetConnection SimGroup SimSet SimObject

Without this the dismount will not work. Anyone have any idea of how could fix this.