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[golanu21]

function onPlayerCreateVehicle_Handler(source, cmd, ...) 
local message = table.concat({...}, " ") 
local messageParameters = split(message, " ") 
    if(string.match(tostring( messageParameters[1] ), "[0-9]")) then-- Check if first parameter are numbers, if so, continue checking. 
        if(not string.match(messageParameters[2], "[0-9]")) then -- Check if second parameter consist only of letters. If so, continue checking. 
                if(string.match(messageParameters[3], "[0-9]")) then -- Check if third parameter are numbers, if so, create vehicle. 
                    local playerX, playerY, playerZ = getElementPosition(source) 
                    local newVehicle = createVehicle(tonumber(messageParameters[1]), playerX, playerY-5, playerZ, 0, 0, 0, messageParameters[2]) 
                    local vehMarker = createMarker(playerX, playerY-5, playerZ-2, "cylinder", 5, 255, 0, 0, 100) 
                        setVehicleLocked(newVehicle, true) 
                    setElementData(source, "marker", vehMarker)  
                else 
                    outputChatBox("[server]: #FF0000/makeveh(Syntax Error!)#1, invalid Key ID! Must consist of numbers!", getRootElement(), 145, 145, 145, true) 
                end 
        else 
            outputChatBox("[server]: #FF0000/makeveh(Syntax Error!)#2, invalid License Plate Text! No numbers allowed!", getRootElement(), 145, 145, 145, true) 
        end 
    else 
        outputChatBox("[server]: #FF0000/makeveh(Syntax Error!)#3, incorrect Car ID!", getRootElement(), 145, 145, 145, true) 
    end 
end 
addCommandHandler("makeveh", onPlayerCreateVehicle_Handler, false) 
  
addEventHandler("onMarkerHit", vehMarker, 
function (hitPlayer, matchingDimension, cmd, vehMarker, ...) 
    if hitPlayer == source then 
        getElementData(source, "vehMarker") 
        outputChatBox("DA DA DA", source, 255, 255 ,255) 
    end 
end) 

ss\server.lua:24: Bad argument @ 'addEventHandler' [Expected element at argument 2, got nil] 

[tosfera]

Found your problem!

local vehMarker = createMarker(playerX, playerY-5, playerZ-2, "cylinder", 5, 255, 0, 0, 100) -- line 9 

Also, predefine the marker;

local vehMarker; -- line 1 

beside that, you know the source of onMarkerHit is the marker that's being hit? Not the player thats walking in. Thats the hitElement.