local vehMarker = createMarker ( 312, 1824, 18, "cylinder", 1.5, 0, 0, 255, 150 ) 
addEventHandler ( "onMarkerHit", vehMarker, openVehicleSpawnServer ) 
  
function spawnVehicleServer ( ) 
    local x,y,z = getElementPosition(source) 
    local myVeh = createVehicle(525,x+5,y,z) 
    if myVeh then 
        warpPedIntoVehicle(source,myVeh) 
        outputChatBox("Fahrzeug erfolgreich gespawnt",source,0,153,0,true) 
    else 
        outputChatBox("Fahrzeugspawn fehlgeschlagen, kontaktiere den Scripter/Hoster!",source,190,160,050) 
    end 
end 
addEvent ("SpawnVehicleServer",true) 
addEventHandler ("SpawnVehicleServer",root,spawnVehicleServer) 
 
P.S: You have the function: "openVehicleSpawnServer", right?