Why does my script not know what HumanoidRootPart is? The script tells it what it is

I'm making a game for fun and I'm coding the MainFramework but with teleporting it says Attempted to index with a nil value:WaitForChild(), Can anyone help me?

Here's the code:

local EventsModule = require(script:WaitForChild("EventsModule"))
local MethodNames = {}

for MethodName, Method in pairs(EventsModule) do
    if type(Method) == "function" then
        table.insert(MethodNames, MethodName)
    end
end

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Remotes = ReplicatedStorage:WaitForChild("Remotes")

local Values = ReplicatedStorage:WaitForChild("Values")
local Status = Values:WaitForChild("Status")

local timeBetweenEvents = 5
local AllPlates = ReplicatedStorage:WaitForChild("Plates"):GetChildren()

local minimumPlayers = 0

while true do
    Status.Value = "Waiting for enough players!"

    repeat wait(1) until game.Players.NumPlayers >= 1

    Status.Value = "Intermission"

    local Plates = ReplicatedStorage.Plates:Clone()
    Plates.Parent = workspace

    local Players = game.Players:GetPlayers()
    local PlayersAlive = {}
    local PlatesAlive = {}

    for i, player in pairs(game.Players:GetPlayers()) do
        local plate = Plates:FindFirstChild("Plates"..i)
        local character = player.Character

        local HumanoidRootPart = character:WaitForChild("HumanoidRootPart")
        if HumanoidRootPart and #Players >= minimumPlayers then
            HumanoidRootPart.CFrame = plate.CFrame * CFrame.new(0,3,0)
            player.serverData.playerPlate.Value = i

            local plateOwner = Instance.new("StringValue")
            plateOwner.Name = "plateOwner"
            plateOwner.Value = player.Name
            plateOwner.Parent = plate

            table.insert(PlayersAlive, player)
            table.insert(PlatesAlive, plate)
            for i, v in pairs(PlayersAlive) do print(i,v) end

            character.Humanoid.Died:Connect(function()
                print(player.Name.." has died")

                table.remove(PlayersAlive, table.find(PlayersAlive, player))
                table.remove(PlatesAlive, table.find(PlatesAlive, plate))
            end)
        end
    end

    for i, plate in pairs(Plates:GetChildren()) do
        local plateOwner = plate:FindFirstChild("plateOwner")
        if plateOwner.Value == nil then
            plate:Destroy()
        end
    end

    while #PlayersAlive > 0 do
        wait(timeBetweenEvents)

        local RandomMethodName = MethodNames[math.random(1, #MethodNames)]
        local Method = EventsModule(RandomMethodName)
        Method()
    end

    Plates:Destroy()
end