What the problem in this gui?

[RenanPG]

  
GUIEditor = { 
    button = {}, 
    window = {}, 
    label = {}, 
    staticimage = {} 
} 
  
function teamgui(player) 
    if not isPlayerInTeam( Player, 'Civil' ) then 
        GUIEditor.window[1] = guiCreateWindow(0.28, 0.25, 0.42, 0.48, "Team panel - ONIX", true) 
        guiWindowSetSizable(GUIEditor.window[1], false) 
  
        GUIEditor.label[1] = guiCreateLabel(0.01, 0.10, 0.96, 0.08, "Escolha seu grupo:  (Choose your team)", true, GUIEditor.window[1]) 
        guiSetFont(GUIEditor.label[1], "default-bold-small") 
        GUIEditor.button[1] = guiCreateButton(0.15, 0.83, 0.25, 0.10, "Cidadão (Citizen)", true, GUIEditor.window[1]) 
        GUIEditor.button[2] = guiCreateButton(0.60, 0.83, 0.25, 0.10, "Civil (Civilian)", true, GUIEditor.window[1])     
         
        GUIEditor.staticimage[1] = guiCreateStaticImage(0.61, 0.18, 0.24, 0.61, "logo1.png", true, GUIEditor.window[1])   
        GUIEditor.staticimage[1] = guiCreateStaticImage(0.16, 0.18, 0.24, 0.61, "logo2.png", true, GUIEditor.window[1])  
    else 
    outputChatBox('Você já possui grupo', player) 
    end 
end 
addEventHandler("onResourceStart", getRootElement(), teamgui) 
  
  

this is a panel for selection of team, it is useful when player join in the server in first time and dont have a team. i will make butons, but my problem, i want that it must be show only when player dont have team.

[Castillo]

if not isPlayerInTeam( Player, 'Civil' ) then 

Your argument name is "player" not "Player".

[Wei]

addEventHandler("onResourceStart", getRootElement(), teamgui) 

onResourceStart is server-side event!

[Karuzo]

btw , outputChatBox doesn't need an player argument Client-Side