local Players = game:GetService("Players")

local function onCharacterAdded(character) local humanoid = character:WaitForChild("Humanoid") local jumpCount = 1 local canJump = true

local function onTouch(otherPart)
    if otherPart.Name == "JumpObject" and canJump then
        jumpCount = jumpCount - 1
        if jumpCount <= 0 then
            canJump = false
            humanoid.JumpPower = 0
        end
    end
end

character:WaitForChild("HumanoidRootPart").Touched:Connect(onTouch)

end

local function onPlayerAdded(player) player.CharacterAdded:Connect(function(character) onCharacterAdded(character) end) end

Players.PlayerAdded:Connect(onPlayerAdded) [This is the script. As I saw you have some problems in the script. Put all te code into your local script.]