kick player problem

[BennyBunny]

Here is a part from my login, register, save system.

The problem is that the kick player not work Warning: bad argument @ 'kickPlayer'

function registercheck () 
  
    local namecheckregister = getPlayerName ( source ) 
  
    checkdbregiser = executeSQLSelect ( "playersave", "playerdb", "playerdb = '" .. namecheckregister .. "'" ) 
  
    if ( type( checkdbregiser ) == "table" and #checkdbregiser == 0 ) or not checkdbregiser then 
  
        outputChatBox ( "Your are login as Guest! Use /register", source ) 
  
    else 
  
        kickplayertimer = setTimer( kickPlayer, 20000, 1, namecheckregister, source, "register name kick" ) 
  
        outputChatBox ( "You are a member use /login in the next 20sec!!", source ) 
  
    end 
  
end 
  
addEventHandler ( "onPlayerJoin", getRootElement(), registercheck ) 

Can someone help me here plz?

[JR10]

  checkdbregiser = executeSQLSelect ( "playersave", "playerdb", "playerdb = '" .. namecheckregister .. "'" ) 
  
    if ( type( checkdbregiser ) == "table" and #checkdbregiser == 0 ) or not checkdbregiser then 
  
        outputChatBox ( "Your are login as Guest! Use /register", source ) 
  
    else 
  
        kickplayertimer = setTimer( kickPlayer, 20000, 1, source, "register name kick" ) 
  
        outputChatBox ( "You are a member use /login in the next 20sec!!", source ) 
  
    end 
  
end 
  
addEventHandler ( "onPlayerJoin", getRootElement(), registercheck ) 

Why this "namecheckregister" in the kickPlayer function.

Please read the function's arguments before using it.