Trying to print a list of groups for everyone that joins the server?

no error btw

http://pastebin.com/7xevCqDs

userId should be UserId

local Players = game:GetService("Players")
local groupsIn = {}
 
game.Players.PlayerAdded:connect(function(player)
local pages = game:GetService("GroupService"):GetGroupsAsync(player.UserId)
while true do
for _, group in pairs(pages:GetCurrentPages()) do
	table.insert(groupsIn, group)
end

if pages.IsFinished then
	break
end
pages:AdvanceToNextPageAsync()
end

print(groupsIn)

end)

Wiki Links:

Player/UserId

if you need any furture help please reply to this!