Why does studio say that leaderstats is not a member of player?

Bcs it happens the same moment the leaderstats are created so it will not work. I got an idea to help you! Try this:

    game.Players.PlayerAdded:Connect(function(player)
wait(2)
        if player.leaderstats.Points.Value == 5 then
            script.Parent.Transparency = 0.5
            script.Parent.CanCollide = false
        end
    end)

So it will wait 2 second (enough to create the leaderstats) See its not that hard(please make this an answering answer)

When you are searching for leaderstats it is still being created.

I think using player:WaitForChild("leaderstats",2).Points.Value might be appropriate here

Problem:

I believe your script was checking through the leaderstats to find "Points" value. Since the leaderstats was trying to find a value; which doesn't exist it resulted in an error. You also didn't parent the intvalue's to the parent which is why it didn't work.

game:GetService("Players").PlayerAdded:Connect(function(player)

    local leaderstats = Instance.new("Folder",player) 
    leaderstats.Name = "leaderstats"


    local Points = Instance.new("IntValue",leaderstats)
    Points.Name = "Points"
    local part = workspace.Part

           if tostring(Points.Value >=0) then
           part.Transparency = 0.5
           part.CanCollide = false
        print("It works!")
        else
        end
    end)

Solution:

Make sure you use tostring; as it has practical uses, especially when making GUI's!

References:

Learn how to make a leaderstat door

How to make a leaderstats door!

Note: If you want it to check constantly, add a wait!

Cheers! JesseSong

I'm not exactly sure what your post is about since im pretty stupid, but I believe your door isn't working since you aren't putting the leaderstats in the player? [In your post at least]. You did:

local leaderstats = Instance.new("Folder") 
leaderstats.Name = "leaderstats"

local Points = Instance.new("IntValue")
Points.Name = "Points"

but you never set the parent of the thing you were creating, so it should be:

local leaderstats = Instance.new("Folder",player) 
leaderstats.Name = "leaderstats"

local Points = Instance.new("IntValue",player)
Points.Name = "Points"

If that still doesn't work, just put a

wait(1)

at the top of your door script

Hope you figure it out!

So what you did worng was that you forgot to put the leaderstats folder to player. So add this script "leaderstats.Parent = player" this will put leaderstarts to the player" and after put "Points.Parent = leaderstats" this will put "point" IntValue into the folder and after do "points.Value = 0" so when a player joins he/she gets 0 points :)

Script:

game.Players.PlayerAdded:Connect(function(player)

 local leaderstats = Instance.new("Folder")
 leaderstats.Name = "leaderstats"
leaderstats.Parent = player

local Points = Instance.new("IntValue")
Points.Name = "Points"
Points.Value = 0
Points.Parent = leaderstats

        end)

and for the door sciript so when you do "while wait()do it will refresh the script everytime so when a player touches so then the door will open :

game.Players.PlayerAdded:Connect(function(player)
    while wait() do 
    if player.leaderstats.Points.Value == 5 then
        script.Parent.Transparency = 0.5
        script.Parent.CanCollide = false
    end
    end
    end)

Hope it helped :)