getPlayerWatedLevel bad argument :(

[-misterX-]

it reports bad argumet on all lines (((

addEventHandler("onPlayerJoin", root, 
    function ( ) 
        setPlayerNametagText ( thePlayer, getPlayerName ( thePlayer ) .."[".. getPlayerWantedLevel ( thePlayer ) .."]" ) 
    end 
) 
  
function updateNametagWantedLevel ( ) 
    for index, player in ipairs ( getElementsByType ( "player" ) ) do 
        setPlayerNametagText ( player, getPlayerName ( player ) .."[".. getPlayerWantedLevel ( player ) .."]" ) 
    end 
end 
setTimer ( updateNametagWantedLevel, 3000, 0 ) 

[-stolka-]

you don't define thePlayer anywhere, change it with source

addEventHandler("onPlayerJoin", root, 
    function ( ) 
        setPlayerNametagText ( source, getPlayerName ( source ) .."[".. getPlayerWantedLevel ( source ) .."]" ) 
    end 
) 
  
function updateNametagWantedLevel ( ) 
    for index, player in ipairs ( getElementsByType ( "player" ) ) do 
        setPlayerNametagText ( player, getPlayerName ( player ) .."[".. getPlayerWantedLevel ( player ) .."]" ) 
    end 
end 
setTimer ( updateNametagWantedLevel, 3000, 0 )