Attempt to call a number value????

I was trying to script a code that teleports players to a certain area when a timer finishes, and from nowhere, when I call the function minutes() its says: Attempt to call a number value.

Please help me.

local timerREM = game.ReplicatedStorage.Timer_RemoteEvent
local Totaltime = {00, 10}  -- For changing the total time of the timer, change the 1st (minutes) and 2nd (seconds) value --
local minutesval = Totaltime[1]
local secondsval = Totaltime[2]
local totaltime = tostring(minutesval.. ": ".. secondsval)

local function minutes()  -- Important Part
    minutesval = minutesval - 1
    totaltime = tostring(minutesval.. ": ".. secondsval)
    timerREM:FireAllClients(totaltime)
end

local function seconds()
    if minutesval == 0 and secondsval == 0 then
        print("The players are spawning again")
        local players = game.Players:GetChildren()
        local PlayerCharacters = {}
        local spawns = game.Workspace.Spawns

        for i, player in pairs (players) do
            table.insert(PlayerCharacters, #PlayerCharacters + 1, player.Character)
        end

        for i, v in pairs(PlayerCharacters) do
            local desiredSpawn = math.random(1, 12)

            v.HumanoidRootPart.Position = Vector3.new(spawns[desiredSpawn].Position + spawns[desiredSpawn].Size/2)
        end

        totaltime = tostring(Totaltime[1].. ": ".. Totaltime[2])
        minutes = Totaltime[1]
        seconds = Totaltime[2]
    end
    if secondsval == 0 then -- Here is the error -- 
        secondsval = 60
        minutes()
    end
    secondsval = secondsval - 1
    totaltime = tostring(minutesval.. ": ".. secondsval)
    timerREM:FireAllClients(totaltime)
end

while true do
    local times = 0
    while times < 60 do
        times = times + 1
        wait(1)
        seconds()
    end
end

The thing is that when I call the function seconds() the script doesnt says there's an error.

This ocurred to me much times, like when I was trying to tween a GUI's position, and when calling functions.