Whats wrong?

[s1mple]

Client.lua

addEvent ( "onDuty", true ) 
function duty()   
    if getElementData(source,"duty") == true then   
        timer = setTimer ( function() 
            setElementData(source,"onDuty",true) 
            local x, y, z = getElementPosition(source ) 
            local playerName = getPlayerName(source ) 
            local theText = dxDraw3DText( "Admin On Duty [NO DM]", x, y, z+1,05,"default",255,0,0,200) 
            setTimer ( function() 
                destroyElement(theText) 
                end, 59, 1) 
        end, 60, 0 ) 
    else 
        if isTimer(timer) then 
            killTimer(timer) 
        end 
        
        setElementData(source,"duty",true) 
    end     
end 
addEventHandler ( "onDuty", root, duty) 

Server.lua

function startgm() 
    accountname = getAccountName(getPlayerAccount(thePlayer)) 
    if isObjectInACLGroup("user." .. accountname, aclGetGroup("Admin")) then 
    do 
    if not getElementData(getLocalPlayer(), "onduty") then 
      gmtimer = setTimer(gmforad, 2000, 0) 
      outputChatBox ("Admin is now: ON DUTY",255, 255, 255,true) 
      setElementData(getLocalPlayer(), "onduty", true) 
    else 
      killTimer (gmtimer) 
      setElementData(getLocalPlayer(),"blood", 12000) 
      outputChatBox ("Admin is now: OFF DUTY!",255, 255, 255,true) 
      setElementData(getLocalPlayer(), "onduty", false) 
    end 
end 
addEvent("onPlayerOnDuty", true) 
addEventHandler("onPlayerOnDuty", thePlayer, startgm) 
  
function gmforad() 
    if getElementData(getLocalPlayer(),"logedin") then 
        setElementData(getLocalPlayer(),"blood", 500000) 
        setElementData(getLocalPlayer(),"bleeding", 0) 
        setElementData(getLocalPlayer(),"cold", false) 
        setElementData(getLocalPlayer(),"temperature", 37) 
        setElementData(getLocalPlayer(),"pain", false) 
        setElementData(getLocalPlayer(),"brokenbone", false) 
        setElementData(getLocalPlayer(),"thirst", 100) 
        setElementData(getLocalPlayer(),"food", 100) 
    end 
end 

[1LoL1]

errors, warnings?

[s1mple]

no errors

[s1mple]

Server.lua works fine but client.lua, it's dosen't work

[Walid]

Server.lua works fine but client.lua, it's dosen't work

Many things wrong:

you can't use getLocalPlayer() server side.

thePlayer it's not defined in your code

Replace source with localPlayer (client side).